American Society of Mechanical Engineers (ASME) IX also referred to as ASME section 9 is the qualification for welders for pressure pipe and vessels. It covers both brazing and welding and it is pretty much the industry standard for testing of pipe welders for power plants and such.
ISO 9606-1:2017 specifies the requirements for qualification testing of welders for fusion welding of steels. It provides a set of technical rules for a systematic qualification test of the welder, and enables such qualifications to be uniformly accepted independently of the type of product, location and examiner or examining body.
When qualifying welders, the emphasis is placed on the welder’s ability manually to manipulate the electrode, welding torch or welding blowpipe, thereby producing a weld of acceptable quality. The welding processes referred to in ISO 9606-1:2012 include those fusion-welding processes which are designated as manual or partly mechanized welding. It does not cover fully mechanized and automated welding processes.
ASME IX has referred to an ISO welding standard in its pressure vessel code. The July 2015 edition of Section IX “Welding and Brazing Qualifications” of the ASME Boiler and Pressure Vessel Code (BPVC) refers to ISO 9606-1:2012 “Qualification testing of welders – Fusion welding – Part 1: Steels” in its Appendix ZZZ. It also cites ISO 14732:2013 on the “Qualification testing of welding operators and weld setters for mechanized and automatic welding of metallic materials”. In Germany the latter standard is published as DIN EN ISO 14732. This means that, in terms of the qualification of welders and welding operators, the two ISO Standards can be considered as being equivalent to the ASME Code and thus apply in the US as well.
This is a great advantage for many international companies. Up until this happened, in order to gain a foothold on the US market welding specialists international companies had to obtain certification to ASME and/or AWS rules in addition to their DIN EN 1090 certification (“Execution of steel structures and aluminium structures”). Companies can now save a considerable amount of money by avoiding multiple qualifications.