This document summarizes the requirements and procedures for a welder qualification test (WQT) at Doosan Heavy Industries & Construction. The summary includes: 1. The WQT will test the welder's ability in various areas like power supply, welding machine, cables, holders, safety equipment, welding processes, materials, and positions. 2. Proper preparation is required including fitting the test coupon, verifying material specifications, selecting the correct filler wire/electrode based on material, and checking welding parameters. 3. The performer's welding knowledge will be assessed through an interview to ensure they understand the welding process, parameters, materials, and safety requirements.

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Welder Qualification Test

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General Arrangements for WQT :
1.Power Supply
2.Welding Machine
3.Welding Cable
4.Welding Holder

4. Tools & Machinery
Safety PPE for Welder :
1.Welding Helmet
2.Welding Gloves
3.Safety Googles
4.Safety Shoes

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Check list before starting the WQT :
1.Test Coupon Fit Up
2.Test Coupon Material Specification
3.Welding Position
4.Welding Process
5.Filler Wire & Electrode
6.Welding knowledge of Performer

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Why check Test Coupon Fit Up?
1.We must identify the Root Gap, Mis Matc
h, Overlap, Dimension of Test Coupon, Thicknes
s Range.

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Why Test Coupon Material Specification?
Material Specification is required before WQT.
Based on material specification only we can approve the
Filler Fire / Electrode, Pre-Heating.
We have various types of material. CS, SS, GI, Alloy, Dis
similar, Etc..

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Why Welding Position checking required?
We have 6 types of Welding Positions.
1.Flat Position - 1G
2.Horizontal Position - 2G
3.Vertical Position - 3G
4.Overhead Position - 4G
When it comes to Piping there are 4 Welding Positions
1.Rolling Horizontal Position - 1G
2.Rolling Vertical Position - 2G
3. Fixed Horizontal Position - 5G
4. Inclined Position (45° Angle) - 6G

10. What is Welding Process ?
A Process which can describes how to weld in a process called
Welding Process.
There are 4 types of Welding Process.
1.GTAW : Gas Tungsten Arc Welding
2.SMAW : Shielded Metal Arc Welding
3.GMAW : Gas Metal Arc Welding
4.FCAW : Flux cored Arc Welding

11. Using of Filler Wire & Electrode Material
Filler Wire & Electrodes must use as per material specification.
Because every filler wire & electrode contains own mechanical
prosperities.
As per ASME Groups are segregated into Groups
P Group
A Group
F Group

12. Why need to take interview of Performer?
Welding performer must know about welding
parameters, welding procedure, welding position, Welding
process, Filler wire & electrode consumption & Identification.

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