Coded welding (otherwise known as “code welding” or “welding codes” refers to welding processes using specific methods. A “coded welder” will have taken a Welder Approval Test in a specific welding configuration, with some codes being more general while others being highly specific and therefore requiring an individual method.

Welding approval codes in the UK are done according to BS EN ISO standards.


How long do coded welding certifications last?

Welded coder certificates are to be signed every six months by a qualified individual as this will confirm the welder still produces welds to the required standard, with a formal re-test being required every two years, at least, to ensure a continuity log is kept.


What is the difference between a certified welder and a coded welder?

The terms certified and coded welder are often used interchangeably in engineering, although there are differences between the two.

Certified welders are welders who hold certification documents which are independently awarded by authoritative bodies. The diploma provides evidence of theoretical and practical welding competence; while coded welders provide proof of their skill set by being tested by their employers to determine whether they can consistently carry out a specific type of welding.

Simply put, certified welders can provide credentials while a coded welder will have passed practical tests to show their skill.


What are the five basic types of welding joints?

It is important to distinguish between a weld and a joint.

There is a wide variety of welds with the most popular (typically) being the fillet weld. Other types include groove welds, spot welds, seam welds and edge welds. We provide the symbols for these and others in our post Weld Symbols UK.

Joints are combined with welds in order to make weld joints, with the five main joints being:

  • Butt joint
  • Corner joint
  • Edge joint
  • Lap Joint
  • Tee Joint

There is a range of qualifications which cover all types of welded joints. An example of joint testing includes:

  • Brazed and soldered joint testing
  • Resistance weld testing
  • Laser weld testing
  • Electron beam weld testing
  • Flash butt weld testing
  • Diffusion bonding testing


Coded Welders – ADS

ADS use an external welding coordinator who provides welder training and certifies welders to national and international welder qualification codes. These regularly assess our team and provide certifications.

We currently have a team of coded welders and longstanding relationships with suppliers who are proficient in the welding of mild steel, stainless steel and aluminium, among other materials.


ADS Laser Cutting is the Premier Metal Laser Cutting, Folding, Fabrication, Finishing and Assembly in the UK. Providing Bespoke to Volume Solutions.

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