1. Industrial piping, (including boiler tubes)
2. Aerospace and aviation (manufacture and overhaul/repair)
For tig welding certification in piping, pressure vessels, and boilers, ASME section IX of the "Boiler and Pressure Vessel Code" specifies the factors for acceptable welding tests.
For Aerospace tig welding, the American Welding Society (AWS) D17.1 - "Specification for Fusion welding for Aerospace Applications" is the code for welding certification tests.
Additional typically than not, a 6G position welding test is needed to certify for Pipe welding jobs. On several boiler jobs, two" heavy wall tubing is tig welded all the manner out in the 6G position creating the welder either switch hands, or at least get in some uncomfortable positions. That is why 6G position Tig welding tests are considered the most difficult.
Customarily, sheet metal test items within the 0.020"-0.125" thickness vary are used for aerospace welder qualification testing. The 6G welding check is solely used often as a result of it will not accurately represent the scope of welding tasks performed for many aerospace and aviation welding applications. AWS D17.one even contains a provision for welders to certify on a scrap part or mock up of a weld that is not represented well by a clear groove or fillet weld.
ASME section IX Boiler and Pressure Vessel Code has been around for a terribly while, but AWS D17.1 is relatively new and was written to interchange two old Mil standards... 1595a and 2219.
One issue each welding certification specifications have in common is that the test welds that are selected for use for certification tests only qualify the welder for a vary of positions, thicknesses, and joint types. No single check qualifies for all the attainable material, thickness, positions, and joint sorts that are possible. That is why some welders hold a dozen or a lot of certifications.
One main difference in welding tests for these two industries is that the initial welding take a look at for Pipe welding jobs are largely done using low carbon steel or stainless steel. Different materials like inconel are typically used additionally however not nearly as abundant as carbon steel and stainless.
Within the Aerospace and aviation industries, It's not uncommon for a welder to be tested on carbon or low alloy steels, stainless steels, nickel alloys, aluminum, magnesium, titanium, cobalt alloys, and even some refractory alloys like Niobium...with separate welding tests required for every material category.
One of the main variations in Tig welding pipe and tig welding aircraft or aerospace parts is during the thickness of material. In Aircraft welding , most everything is thinner. and that means smaller electrodes, smaller filler wire, smaller torches...and in Aircraft and Aviation tig welding, a 1/16" rod is taken into account pretty big.
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Aaron R Daniel has been writing articles online for nearly 2 years now. Not only does this author specialize in Certification Tests, you can also check out his latest website about:
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