Source: https://amarineblog.com/2017/11/07/welder-qualification-follow-asme-ix-part-2-essential-variable-for-welder-qualification/
Timestamp: 2020-03-30 06:39:17
Document Index: 722240820

Matched Legal Cases: ['art 2', 'art 1', 'art 1', 'art 2', 'art 1', 'art 3']

Welder qualification follow ASME IX- Part 2: Essential Variable for Welder Qualification! – AMARINE
Following the discussion in Part 1: Welder qualification follow ASME IX- Part 1: Genenral
Now we continue with the concerns on Essential Variable for Welder qualification status in Certification and Welding limitation at the site.
1) Essential variable ( QW-351 ) – for welder:
– A welder shall be requalified whenever a change is made in one or more of the essential variables listed for each welding process.
– Take an example for GTAW process: ( for other welding process, we do same thing, check each variable to know what happen on it when we change them ).
+ Joints: QW-402.4 states the deletion of backing is essential
Welders were qualified with backing so they are only allowed to weld on backing.
To be see more in ASME IX:
+ Base metal:
– QW-403.16 states a change in the pipe diameter qualified is essential.
Welders were qualified on plate so they can only weld on plate.
A change in the pipe diameter:
– QW-403.18 states a change in the P-No. material qualified is essential.
Welders were qualified on P-No. 1 material so they are qualified to weld P-No. 1 through P-No. 15F, P-No. 34, and P-No. 41 through P-No. 49.
QW-420:
QW-423:
+ Filler metal:
QW-404.14: states a change between using filler metal or not using filler metal is essential. Welders were qualified with filler metal so they are only allowed to
weld with filler metal.
QW-404.15 states a change in F-No. is essential. Ex: Welders were qualified with F-No. 6 so they are only allowed to weld with F-No. 6.
QW-404-22 states a change between using a consumable insert or not using consumable insert is essential. Welders were qualified without a consumable insert so they are only allowed to weld without a consumable insert.
QW-404.23 states a change in the type of filler metal is essential. Welders were qualified using a solid wire so they can only weld with a solid wire.
QW-404-30: states a change in the weld metal thickness qualified is essential. Ex: Welders deposited 1/4-in. GTA weld and 1/2-in. of GMA weld so they are qualified to deposit an 1/2-in. GTA weld and unlimited GMA weld.
+ Position: QW-405
QW-405.1 states a change in the position qualified is essential. Ex: Welders were qualified in the flat (1F) position so they can only weld in the 1F position.
QW-405.3 states a change in the weld direction for vertical weld is essential.
+ Gas: QW-408.8 states the omission of inert gas backing is essential. Ex: Welders were qualified with backing so the variable does not apply.
+ Electrical: QW-409.4: states a change in the current and polarity is essential. Welders were qualified using DCEP so they can only weld using DCEP.
Pls read ASME IX to know more information. We just show how we check essential variable follow ASME IX.
Pls see next part: How to carry out a Welder qualification!!!
2 thoughts on “Welder qualification follow ASME IX- Part 2: Essential Variable for Welder Qualification!”
Pingback: Welder qualification for Fillet weld following ASME IX – AMARINE
Previous Previous post: Welder qualification follow ASME IX- Part 1: Genenral
Next Next post: Welder qualification follow ASME IX- Part 3: How to carry out a Welder qualification!!!