AMET Inc., 355 Dividend Dr., Rexburg, ID 83440 USA - Tel: (208) 356-7274 - Fax: (208) 356 8932 - Email: amet@ametinc.com

XM Linear Seam Welders

AMET's Linear Seam Welders are designed as a complete solution for performing linear welds. Typically these 

parts are cylindrical, but other shapes can be accommodated. Each is equipped with our world-class controls 

and servo motor driven motion axes for precise control and consistent performance.

These seam welders are designed to provide ease of use, quality, robustness, high-precision, and 

repeatability. The main structure and base are constructed of heavy-wall structural steel to maintain rigidity and 

extend service life. 

Many weld processes, such as GTAW, PAW, GMAW, and FCAW can be integrated into our seam welders.

Additionally, we can provide seam welders with a multi-process weld head.

Benefits

AMET Uses High Quality Components

Precision bearings and rails provide 

smooth carriage motion resulting in 

consistent welds with an even bead.

Precision controls, +/- 1% of set speed, 

helps ensure repeatable weld head 

motion for dependable performance. 

This is especially beneficial for high 

volume part runs.

Machined track, which is stress relieved 

to extend the service life and provide 

consistent and repeatable motion.

AMET uses hi-flex cabling and a flexible 

cable chain to organize cables and 

extend service life.

Double wall pneumatic hose provides 

uniform clamping along the length of the 

weld bed, virtually eliminating the need 

for pre-tacking parts prior to loading 

them into the seam welder. This 

reduces material, labor, and 

consumables costs.

End Use Examples

Flat Sheet/Panel Welding

Steel Hose Manufacturing

Hot Water Tanks

Jet Engine Components

Over-The-Road Trailer Tankers

Construction Products

Fuel Tanks

Storage Tanks

Air Cylinders

HVAC Components

Pressure Vessels

GMAW Flat Sheet Welding Internal Welder for trailer tankers
AMET Inc., 355 Dividend Dr., Rexburg, ID 83440 USA - Tel: (208) 356-7274 - Fax: (208) 356 8932 - Email: amet@ametinc.com

Standard Features

1. A travel carriage rides on four (4) precision linear 

rail bearing blocks with a rack and pinion drive 

assembly and servo motor drive with home and limit 

switches for precision and repeatable motion. Also 

includes a cable carrier to organize and protect 

cabling.

2. The seam welder track is stress relieved prior to 

machining, which maintains tight tolerances and 

dimensional stability over the life of the equipment.

3. A safety interlock is provided at the mandrel latch. 

The switch prevents clamping when the mandrel is 

open and prevents unclamping while a weld is in 

progress.

4. Double wall hose provides uniform pneumatic 

clamping force to each of the clamping fingers. 

Clamping pressure is adjustable for various 

material thicknesses.

5. The copper fingertips provide excellent 

conduction and aid in chilling the weld zone. The 

fingertip distance from back to front is adjustable 

to accommodate for the welding process and the 

materials being welded.

6. Two (2) manually retractable part alignment 

devices facilitate positioning the weld joint along 

the centerline of the seam welder prior to clamping 

and welding. Each device can be repositioned 

along the length of the seam welder.

7. The adjustable height seamer mandrel 

accommodates materials of various 

thicknesses and is plumbed to accept 

water-cooling to help draw heat out of the 

weld joint. 

8. Foot-activated tape switches are used to 

operate pneumatic clamping and 

unclamping of the seam welder fingers. A 

single tape switch is mounted to the back 

leg of the seam welder and controls the 

back clamping fingers, while dual tape 

switches are mounted to the front leg and 

control the front and back clamping fingers 

respectively.

9. AMET Seam Welders utilize heavy-duty, 

thick wall structural steel construction to 

minimize part distortion during clamping and 

provide superior heat absorption and 

dissipation during the welding process. The 

heavy construction increases the rigidity 

and extends the equipment’s service life.

Optional Features

Automatic Finger Release

Gas Back-up Insert

Auto Gas Purge with Gas Backup Insert

Pneumatic Centering Devices

Pneumatic Mandrel Latch

Dual Pressure Clamping

Part Loading Carts

Removable Riser – Increase diameter capacity 

up to 72 inches

Continuous Clamping Strips
AMET Inc., 355 Dividend Dr., Rexburg, ID 83440 USA - Tel: (208) 356-7274 - Fax: (208) 356 8932 - Email: amet@ametinc.com

Capacities

The seam welders have the following capacities:

Weld Length: 600 to 6000mm (23.6 to 283.4 in) with an additional 75 mm (2.9 in) on each end for runon and run-off tabs.

Minimum Diameter Capacity: 70 to 615 mm (2.8 to 24.2 in) ID depending on the length of the seam 

welder selected.

Maximum Diameter Capacity: 910 mm (35.8 in) standard capacity, additional capacity is available.

Carriage Speed: 50 to 4000 mm/min (1.9 to 157.4 in/min) with rack and pinion gear drive.

Travel Accuracy: +/- 0.4 mm per 3 meters (.02 in per 9.8 feet).

Wall Thickness: The mandrel height is adjustable for sheet thicknesses of 0.5 to 10.0 mm (.02 to .39 

in).

Pneumatic Clamping Force: Adjustable up to 72 kg/cm (4838 lb/ft).

Carriage Weight Capacity: 150 kg (330 lbs) at a distance of 300 mm (11.8 in) from carriage faceplate.

AMET Seam Welder Solution Examples

Micro GTA Seam Welder for metal seal 

manufacturing used in jet engines.

Internal dual wire GMAW seam welder for-overthe-road trailer tanker manufacturing.

Fully automated GMAW seam welder for heavy 

agricultural machinery manufacturing

Elevating plasma seam welder for stainless steel 

tank and vessel manufacturing.
AMET Inc., 355 Dividend Dr., Rexburg, ID 83440 USA - Tel: (208) 356-7274 - Fax: (208) 356 8932 - Email: amet@ametinc.com

LSWI – Internal Seam Welder

The internal seam welder is designed to weld flat 

sheet and larger tanks and vessels from the inside 

with the cylinder wrapping around the track and 

tabletop assemblies. These seam welders are 

typically used on flat sheet conveyor lines for easier 

sheet loading. 

The table top construction is titled inward forming a 

“V”shape and the distance between the track and 

the table is reduced to provide the smallest 

envelope possible. The base and mandrel are an 

integrated unit for increased rigidity and clamping 

capability.

LSWFS – Flat Sheet Seam Welder

The flat sheet seam welder is specifically designed 

for making flat sheet welds, typically in panel 

welding lines. It uses a standard table top, which is 

more open and easier for the operator to observe 

the welding process, but with the base of an 

internal seam welder.

LSWC – Combination Seam Welder

The Combination Seam Welder is a multi-function 

system that combines both internal and external 

welding capabilities. The seam welder can perform

external welds on smaller diameter parts and 

internal welds on larger diameter parts for a more 

versatile seam welding solution. Large diameter 

parts with heavy wall thicknesses may require 

additional 

supporting 

equipment 

such as an 

overhead 

crane.

The 

combination 

seam welder 

utilizes a 

separate mandrel and base assembly like the 

standard seam welder but with a tabletop like the 

internal seam welder. This allows for internal welds 

to be performed on smaller diameter parts than the 

standard external welder would be able to achieve.

LSWE – Elevating Seam Welder

On this seam welder, the track, table top, and 

mandrel assemblies of an LSW are attached to a 

large hydraulic cylinder. The entire structure with 

clamping and welding capabilities can be raised to 

increase the maximum part diameter from 910 mm 

(36 in) to 2400 (96 in). This allows for external 

welding of a greater range of parts than the 

standard external seam welders.

These seam welders are ideally suited for “job 

shops” that manufacture a large range of vessels, 

tubing, and tanks. They provide a much wider 

range of part diameter capabilities while still 

providing the same level of high quality and 

repeatable welds of the standard seam welder.

Maximum weld lengths for the 

elevating seam welders is 

4200mm (165.3 in)

Precision Benchtop Seam Welder

The precision benchtop 

seam welder includes a 

ball screw drive for 

precise movement with 

minimal backlash. They 

are built using a smaller 

frame and carriage, so 

the maximum material 

capacity is reduced to 

4.0 mm (0.157 in). Weld 

lengths range from 75 to 900 mm (2.9 to 35.4 in). 

Other versions of seam welders are available in 

precision configurations with ball screw drives.