Published on 05-Jun-2020

How to qualify a welder?

How to qualify a welder?

This blog will let you know how to qualify a welder.

Purpose of welder qualification:

To certify the ability of the welder to perform a specific welding process based on the qualified Welding Procedure Specification WPS, about qualification of welding procedure as per standard , I will explain in a different Blog.

Welder qualification will be done based on a qualification standard such as ASME BPVC Section IX, AWS D1.1, ISO 15614, etc, here we see the welder certification based on standard ASME Section IX

Welder Qualification based on ASME Sec IX.

  1. Welding Process

Conclude the welding process in which welder to be qualified for

  • SMAW- Shielded Metal Arc Welding
  • GTAW – Gas Tungsten Arc Welding
  • FCAW – Flux Cored Arc Welding
  • GTAW – Gas Tungsten Arc Welding
  • SAW – Submerged Arc Welding (for welding Operator)
  1. Welding Type

Manual or Semi Automatic or Automatic

  1. Select appropriate Welding Procedure Number based on which welder is qualified ,
  2. See weather welder is going to weld with backing or without backing
  3. Pipe Diameter the welder is going to weld for test weld
  4. P Number of the material as per WPS and/or the test piece (refer: Table QW/QB-422 )
  5. F Number of the Filler metal the welder is using and/or as per WPS (Refer: Table QW-432)
  6. ‘t’ Thickness of the weld metal deposited during the test weld
  7. Position of the weld specimen 1G/ 2G/ 3G/ 4G/ 5G/ 6G,
  8. Progression (Uphill or Downhill)

Essential Variables for Welder Qualification is given in para QW-350 of ASME section IX,

A Test weld coupon of Plate or pipe is prepared as shown below °

Welder Qualification

The Diameter of pipe is selected as per required qualification range , refer the table QW452.3 given below

welder Qualification

Weld Size Qualified & Fillet Size(t)  qualified is given in the table QW452.1(b) below:

Welde Qualification

welder qualification

After completion of test weld, Required Tests as per Table: QW452.1(a) should be satisfied.welder qualification

Position Qualified for Welder Performance:

The welding Position qualified for production weld depends upon the test weld position. As showln in the below TableQW461.9

welder qulaification

Filler Metal F-Number Qualification. Refer table QW 433 (below)

How long is the validity of Welder Certificate?

The welder certificate as per ASME section IX will remain valid unless the welder is idle or has not welded in the particular process for a period of 6 months,

Therefore a record for continuous performance should be maintained.

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Application Notes