HW970 Handheld Laser Welding
Head User Manual
HW970 Holding Welding Head User Manual
Version V1.1

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Contents
I.

Abstract ................................................................................................... 3
Key points
Audience
Modify record

II.

Overview ................................................................................................. 4
Safety Instructions
Product appearance
Structure composition
Product Highlights

III.

Product configuration ........................................................................... 8
Configuration parameter
Configuration checklist
Operation steps

IV.

Mechanical installation ........................................................................ 10
Waterway installation
Pneumatic installation
Optical fiber interface
Fiber insertion and locking

V.

Beam focusing ...................................................................................... 13
Adjust the focus position
Spot center adjustment

VI.

Cleaning and maintenance .................................................................. 14
Welding head cleaning and maintenance
Clean the lensRemoval and installation of lensReplace the copper nozzle:

VII. Switching to cleaning mode ............................................................... 19
Replace with cleaning parts
Enable the cleaning mode on the touch screen

VIII. Instructions for welding head wireless control module .................. 21
Wireless handheld laser welding head and controller wiring
Touch screen interface operation
Instructions for Handheld Welding Wireless Control Module
Matters needing attention

IX.

Adjusting the spot size of the handheld laser welding head .......... 242

Abstract
Key points
This manual covers the safe use, basic installation, factory settings, operating
instructions, and maintenance services of the HW970 (handheld welding) series
products.

Audience
This manual is mainly applicable to the following staff:⚫
⚫

Installation Engineer
Maintenance Engineer⚫

Operator

Please read this manual carefully and confirm to understand its contents before
using this product.

Modify record
The record modification accumulates the description of each document update.
The latest version of the document contains updates from all previous document
versions.
The company reserves the right to modify the products and productspecifications in this manual without prior notice.
Document version update record:
V1.0（2021-1）

Overview
This manual describes the safe use, basic installation, factory settings,
operation instructions, and maintenance services of the HW9XX (handheld welding)3series products. There are many specific optical and mechanical custom
configurations, and this manual only introduces its main unit components.

Laser welding is a new welding method and handheld laser welding is more
widely used. The handheld laser welding head has the advantages of beautiful
appearance, small and light weight, wide use range, simple operation and fineweld seam, which greatly improves the welding efficiency and quality. Handheld laser welding solves the existing welding problems such as poor weldingof corners, insufficient welding, post-processing of welds, unsightly welds,
and so on. It is the first choice for most metal welding.

Safety Instructions
Please read the following safety precautions and suggestions carefully before
operating the laser and handheld laser welding head.
1. Please observe all safety instructions for laser (including but not limited todescriptions of laser and the related chapters in this document)
2. Please ensure that do not look directly at the laser beam at any time or under
any circumstances. Do not look directly at the laser emitter port even if you
wear laser protective goggles.
3. It is forbidden to aim the laser at any human body, animal, vehicle, sky, etc.
The operator shall be legally liable for the (direct, indirect and incidental)
injury to the object, and the company shall not bear any liability and loss.
4. When using laser, wear laser protective goggles of the corresponding
wavelength to protect your eyes from the threat of laser.
5. At any time, please turn on the power of the controller and other control parts
before turning on the power of the laser. Otherwise, it may cause injury byuncontrollable laser beam.
6. Any repair or maintenance must be done by professionally trained personnel!
Professionals must have received safety training, understand possible hazards
and be familiar with safety measures to deal with hazards.

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Product appearance

Figure 1 -Appearance of HW970

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Structure composition
As shown in Figure 2, the welding head consists of seven basic units: QBH
connector, collimation module, galvanometer module, wireless control module,
focusing module, protective mirror module and nozzle module.
Focusing module
Protection

modulemoduleNozzle module

Collimation

moduleconnector

Figure 2 - Structure of HW970⚫

QBH connector: complete the access and lock of the optical fiberconnector.

⚫

Collimation

module: complete the fiber

collimation

functionandcollimate the incident laser into a parallel beam.
⚫

Galvanometer module: Vibrate and reflect the collimated parallel laser6

at a certain angle to change the direction of the original beam andthe shape of the spot.
⚫

Wireless control module: quickly adjust some high-frequency parameters.

⚫

Focusing module: Focus the reflected beam into a convergent beam with highpower density.

⚫

Protection module: The protective lens can protect the focusing lensfrom the damage of returning slag and prolong the service life of the
focusing lens.

⚫

Nozzle module: guide the focused beam to the workpiece, and generate
high-speed airflow to protect the molten pool from oxidation to achieve
high-quality welding results. You can also adjust the focus distanceby adjusting the nozzle length.

Product Highlights⚫

Cool appearance, ergonomic design, comfortable grip⚫

Adjustable spot size, high welding firmness, and beautiful lines⚫

Wireless control module, quick adjustment of parameters, one key tocomplete wire feeding or rewinding⚫

The light spot can be adjusted to the center position⚫

Selection of high-quality precision optical components, excellent andstable beam quality⚫

Compact structure design, high dustproof level7

Product configuration
HW970 handheld laser welding head is mainly used for plane processing
applications within 2000W, and has very high versatile. Standard configuration
model: HW970-z50-f150.

Configuration parameter
Parameter nameTechnical index

Maximum applicable laser power

2000W

Optical fiber interface type

QBH

Focus lens specifications

Dia=20mm，F=150mm

Collimating lens specifications

Dia=20mm，F=50mm

Maximum clear aperture diameter

16mm

Laser wavelength

1064nmWelding head weight≤1000gMaximum external size of welding head (width)

47mm
Outer diameter 10mm, tolerance -Nozzle size

0.02mm to -0.04mm, length 72.5mm

Configuration checklist
Product name

Quantity

Handheld laser welding head

1set

Spare copper nozzle

4pcs

Spare protective lens
5pcs
Note: The above table is only for the standard factory configuration

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Operation steps
1. Connect the circuit between the laser, the controller and the galvanometer

driver. Connect the power cord. For the wiring method, refer to the electricalcontrol section of the user manual.
2. After getting the laser welding head, connect the optical fiber connector

first, and then connect the air pipe, water pipe and switch circuit.
(Thedetailed installation method of each connector is described later)
3. Turn on the power of the controller and wait for the screen of the laser

controller to start up, then turn on the laser switch and the water cooler
switch.
4. Set the relevant values on the controller screen (refer to the <User Manual

Electric Control Part> to set various parameters)
5. Put on goggles, hold the welding head with the welding head facing themetal welding piece, and observe whether there is red light at the copper
nozzle of the welding head. If there is no red light, check whether the laser
emits light normally.
* Note: Observe the red light from the side of the welding head, and it isstrictly forbidden to look directly at the laser beam with your eyes.
6. Position the welding parts, adjust the angle of the welding head to makethe red light shine on the seam to be welded, and the copper nozzle touches thewelding parts, and then manually turn the switch on the welding head to start
light welding.
*Note: if only part of the red light comes out of the nozzle or the red lightcannot be seen at all, do not emit the laser.

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Mechanical installation
Waterway installation
The HW970 handheld welding head is equipped with a set of cooling water
channels. It should be noted that when the laser power is greater than 500
watts, it is recommended to use water cooling. From Figure 3, you can see theposition and number of the water cooling ports, and the table below lists therecommended water flow speeds in detail. The design of the water coolinginterface is a closed loop system. External water supply can be used freely,
but the requirements in the list must be met

Water cooling outlet

Water cooling inlet

Figure 3 HW970 water cooling interface
Parameter nameParameter value

Cooling water pipe diameter (outer

6mm

diameter)
Minimum flow rate

1.8liters/minute（0.48gpm）

Inlet pressure170-520kPa(30-60 psi)

Inlet temperature≥room temperature/＞dew point

Hardness (relative to CaCO3)＜250mg/liter

PH range

6 to 8Passable particle size

Less than 200 microns in diameter

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Pneumatic installation
Impurities in the welding gas such as hydrocarbons and water vapor candamage the lens. The following table shows the recommended welding gas
specifications. The higher the gas purity is, the better the quality of thewelding gap is.
Impurities can be filtered out in the gas supply pipeline, but oxygen andwater vapor can penetrate into the optical path system through non-metallic
materials, which is the source of dust and hydrocarbons. It is recommended touse stainless steel accessories, and a filter that can remove particles as
small as 0.01 microns must be used for purification.
It is recommended to use a pressure gauge with a stainless steel
diaphragm. Industrial pressure gauges will inhale air. If a rubber diaphragmis used, hydrocarbons will be generated due to aging and other reasons.
HW970 provides 1 way welding gas connection. The outer diameter of the gas
pipe is 6mm. As shown in Figure 4 below.

Pneumatic interface

Figure 4 HW970 pneumatic interface
Welding gas

PurityNitrogen99.99%

Argon

99.998%Helium

99.998%

Optical fiber interface
HW970 is suitable for most industrial laser generators. It is equipped witha collimator lens assembly.
The connection between the end of the optical fiber and the welding head iscalled the optical fiber connector. HW970 comes standard with QBH optical fiberconnector, as shown in Figure 5 below.

11Figure 5 HW970 optical fiber input interface-QBH
Note: The optics must be kept clean, and all dust must be removed before use.
If the welding head is to insert the optical fiber vertically, the welding head must
be rotated 90 degrees to a horizontal position, and then insert the optical fiber
to prevent dust from entering the interface and falling on the surface of thelens. Fix the laser head after inserting the optical fiber.

Fiber insertion and locking
First, align the red dots on the end face of the QBH interface with thered dots of the rotating handwheel; then, remove the QBH dust cap, align the
red mark of the fiber output end with the QBH red mark, and insert it straightto the bottom; next, rotate the QBH hand wheel clockwise to reach the rightposition when hearing the sound of "Da", then pull the handwheel upwards andturn it clockwise to the end again. As shown in Figure 6 below.

Figure 6 HW970 QBH fiber optic connector insertion and locking diagram
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Beam focusing
Adjust the focus position
The welding head can adjust the focus position. The adjustment method is
to rotate the locking ring counterclockwise. After loosening, adjust thecopper nozzle extend the length to obtain the required spot energy. After
adjusting the position, tighten the locking ring to lock the copper nozzle in
the position just adjusted. There is a scale on the copper nozzle, which isconvenient and quick to adjust, as shown in Figure 7:

Lockingring adjustment knob
Figure 7 HW970 Focus
position

Spot center adjustment
Adjust the light spot to the horizontal center position of the nozzle.
Adjustment method: power on the HWS5000 galvanometer handheld welding system,
set the "Width" to 0mm on the touch screen → click "advanced parameters" →enter the password "2000" → click "login" → set the "optical core offset"
parameter. When the "optical core offset" parameter is set to be small, theoptical core is shifted to the right; when the "optical core offset" parameteris set to be large, the optical core is shifted to the left; set appropriate
parameters so that the optical core is in the center.

Figure 8 Adjusting the optical core offset parameters

13Cleaning and maintenance
Welding head cleaning and maintenance
When the welding head is used, a layer of black ash is attached to thecopper nozzle. This is the spark sputtering after the metal is heated, andthen attaches to the nozzle. There is also some dust in the air. After use,
wipe the nozzle gently with a clean cloth. Then, clean the dust on the welding
head; in a relatively clean environment, pull out the drawer and check whether
the protective lens is clean. When the welding head is not in use, plug thecopper nozzle with tape or a rubber cap to prevent dust from entering thelens. If you unplug the fiber connector, immediately block the hole of thefiber input connector (QBH) with a dust cap to prevent dust from entering thefiber connector.

Clean the lensThere is a protective lens at the front of the welding head to protect thefocusing lens. When impurities or foreign matters are attached to theprotective lens, the lens will be damaged. Therefore, the lens needs to be
maintained regularly. It is recommended to check it before each use. Pleaserefer to Figure 9 for lens structure.

Figure 9 HW970 protective mirror module split diagram14

■ Lens cleaning tools：
Dust-proof gloves or finger cots, polyester cotton swabs, absolute ethanol,
rubber air blower (clean compressed air), etc.

■ Lens cleaning method and matters needing attention:（1） Wear finger cots on the thumb and index finger of the left hand;（2） Spray ethanol on the polyester cotton swab;（3） Gently pinch the side edge of the lens with the thumb and index fingerof the left hand. (Note that the finger cot cannot touch the surface of thelens to avoid leaving traces);（4） With the lens facing both eyes, hold the polyester cotton swab in yourright hand, gently wipe the lens from bottom to top or from left to right in asingle direction (do not wipe back and forth to avoid secondary pollution of
the lens), and use rubber air blower (clean compressed air) blows the surfaceof the lens. Both sides should be cleaned. After cleaning, reconfirm that
there are no residues of the following: detergent, floating dust, foreign
matter, and impurities.

Removal and installation of lens
The entire process must be completed in a clean place, and dust-proof
gloves or finger cots must be worn when removing and installing the lenses.
■ Disassembly and assembly of the lower protective lens:Protective lens is a vulnerable part and needs to be replaced after damaged.
（1） As shown in Figure 10, loosen the locking screws, pinch both sides ofthe drawer-type lens holder and slowly pull out the protective lensdrawer;（2） Rotate the protective lens cover 90° to remove the protective lenscover; take it out from above Lens;（3） Clean the lens, protective lens drawer and sealing ring. If thesealing ring is damaged, replace it with a new one;(4) Install the cleaned (or replaced) lens (regardless of the front andback) to the protective lens in the drawer;

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(5) Reinstall the protective lens cover;(6) Reinsert the protective lens holder back into the welding head, andtighten the locking screw.
Protective lens drawer

Protective lens coverProtective lens D20X3

Picture 10 HW970 protective lens split diagram■ Disassembly and assembly of the upper protective lens and focusing lens:（1） As shown in Figure 11, loosen two M3X8 Hexagon socket screws, pinch bothsides of the drawer-type lens holder and slowly pull out the focusing lensdrawer;（2） Remove focusing lens: use a small cross screw to loosen four M2X5
Phillips screws, remove the focusing lens cover; take out the focusing lensD20-F150（3） Remove the protective lens: carefully remove the D20.55 sealing ring, andtake out the protective lens D20X3.
（4） Install the cleaned (or replaced) lens into the focus lens drawer（5） Reinstall the focusing lens cover and D20.55 sealing ring.
（6） Reinsert the focusing lens drawer back into the welding head, and tighten

the locking screw.

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M3X8 Hexagon socket screws

Focusing lens D20-F150

Figure 11

Split diagram of upper protection lens and focusing lens on HW970

Replace the copper nozzle:
In the process of laser welding, the nozzle will touch the welding pieces andrub against the metal parts. Nozzle is consumable accessory and needs to be
replaced after a period of use. The nozzle equipped is a combination nozzle,
which is composed of a stainless steel bottom tube and a copper nozzle. The
copper nozzle has different styles and can be used in different scenarios. The
corresponding copper nozzle is required to use different thickness of welding
wire. Refer to Figure 12.
■ Replace nozzle：（1） Before replacement, the laser enable should be turned off, and thewelding head should be facing in front with no one ahead;（2） Unscrew the copper nozzle counterclockwise;（3） Replace with a new nozzle.

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Direction of unscrewing

Fig. 12 diagram of nozzle replacement18

Switching to cleaning mode
Replace with cleaning parts
Replace the nozzle module and chuck locking ring with a dustproof lighttransmission frustum.
Replace the focus lens module (D20-F150) with the focus lens module (D20F600)

HW970-Dustproof transmission frustum
focus lens module (D20-F600)

focus lens module (D20-F150)

HW970-nozzle module-65

HW970-chuck locking ring

Enable the cleaning mode on the touch screen
Click the red button "Switch to cleaning mode" on the upper right of thewelding interface.

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Enter the password “5000” in the pop up window.

Enter the cleaning interface.

After switching to the cleaning mode, the light can be emitted only when the
ground wire clamp is clamped on the wire feeding assembly.
Click "switch to welding mode" in the upper right corner of the cleaninginterface to switch to the welding interface.

20Instructions for welding head wireless control module
Wireless handheld laser welding head and controller wiring
Wireless module-DB9

The wireless receiving module is inserted into the DB9 female socket of thecontroller through USB
DB9 male connector

Touch screen interface operation
1. Click the "Home" button21

2. Click the "controller config" button to enter the controller configurationinterface:

3. Check "enable" to turn on the wireless control function of the welding head.
The wireless communication address needs to be consistent with thecommunication address of the wireless controller on the welding head.

Instructions for Handheld Welding Wireless Control Module
Operating Instructions for Wireless Communication Module
Display screen

Left

Right
OK

1. Display screen: displays the man-machine interaction interface such asparameter functions.
2. OK key: Short press to enter the parameter editing state, each time youpress, the next parameter item is selected, the selected parameter flashes,

22and the parameter is set by the left or right button; if no key is pressed
within 5 seconds or the parameter is not set, return to non-editing Status, theparameter stops flashing; long press in the non-editing state to trigger the
power slow-down function, release it to stop the power slow-down.
3. Left button: Press to decrease parameter value or switch function state inparameter editing state. Long press in the non-editing state to turn on thewire feeding function, release it to stop the wire feeding.
4. Right key: Press to increase the parameter value or switch the function statein the parameter editing state. Long press in the non-editing state to turn on
the thread rewinding function, and release it to stop thread rewinding.

Function introduction
1. Communication status: (status: normal\disconnected)
Shows whether the wireless connection is successful. "Normal" means thatthe wireless communication is connected, and "disconnected" means that thewireless communication is not connected.
2. Light emitting mode: (status: spot shooting\continuous)
Corresponding to the touch screen "light mode" parameter. The "continuous"light mode and "spot shot" light mode can be adjusted.
3. Laser power: (range 0%-100%)
Corresponding to the "peak power" parameter of the touch screen, adjust the
maximum power during the stable light emission period.
4. Scanning width: (range 0mm-4mm)
Corresponding to the "scan width" parameter of the touch screen,Set thebeam swing width.
5. Spot enable: (status: on\off)Corresponding to the touch screen "spot enable" parameter, turn on/off theswinging spot.
6. Spotting time: (range: 0S-1.0S)
Set the light emission time in the spot mode corresponding to the "pulse
time" parameter in the "advanced parameters" interface of the touch screen.
7. Wire feeding speed: (range: 0%-100%)
Set the running speed of the wire feeder corresponding to the "Wire feeding
speed" parameter on the touch screen.
8. Wireless pairing: (Status: On\Off)23

Cooperate with "Enter Pairing" in the "Controller Configuration" interfaceof the touch screen to achieve wireless pairing.
9. Language switching: (Status: Chinese\English\Traditional)
Switch interface language display, support: Simplified Chinese, English,
Traditional Chinese.

Matters needing attention
1) The wireless controller needs to avoid shielding or interference.
2) The wireless control receiver cannot be plugged in or out with power.

Manual for adjusting the spot size of the handheld laser weldinghead
Set "Sweep speed". The larger the parameter setting, the faster the spot
swing frequency.
Set "Width". The larger the parameter setting, the greater the swing
amplitude of the spot.
Turn on the "Fadndex". the light spot swings according to the " Sweep speed"and "Width". Turn off the light spot enable and the spot stops swinging.

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