2 industries that require tig welding certification are:
- Industrial piping, (together with boiler tubes)
- Aerospace and aviation (manufacture and overhaul/restore)
For tig welding certification in piping, strain vessels, and boilers, ASME part IX of the “Boiler and Stress Vessel Code” specifies the standards for acceptable welding checks.
For Aerospace tig welding, the American Welding Society (AWS) D17.1 – “Specification for Fusion welding for Aerospace Functions” is the code for welding certification checks.
Most of the time, a 6G place welding check is required to certify for Pipe welding jobs. On many boiler jobs, 2″ heavy wall tubing is tig welded all the way in which out within the 6G place making the welder both change arms, or no less than get in some uncomfortable positions. That’s the reason 6G place Tig welding checks are thought-about probably the most troublesome.
More often than not, sheet metallic check items within the 0.020″-0.125″ thickness vary are used for aerospace welder qualification testing. The 6G welding check is barely used sometimes as a result of it doesn’t precisely characterize the scope of welding duties carried out for many aerospace and aviation welding functions. AWS D17.1 even has a provision for welders to certify on a scrap half or mock up of a weld that’s not represented properly by a plain groove or fillet weld.
ASME part IX Boiler and Stress Vessel Code has been round for a really very long time, however AWS D17.1 is comparatively new and was written to interchange 2 outdated Mil requirements… 1595a and 2219.
One factor each welding certification specs have in frequent is that the check welds which are chosen for use for certification checks solely qualify the welder for a variety of positions, thicknesses, and joint varieties. No single check qualifies for all of the attainable materials, thickness, positions, and joint varieties which are attainable. That’s the reason some welders maintain a dozen or extra AWS certifications.
One major distinction in welding checks for these 2 industries is that the preliminary welding check for Pipe welding jobs are largely accomplished utilizing low carbon metal or chrome steel. Different supplies like inconel are generally used additionally however not practically as a lot as carbon metal and stainless.
Within the Aerospace and aviation industries, It’s not unusual for a welder to be examined 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 checks required for every materials class.
One of many major variations in Tig welding pipe and tig welding plane or aerospace elements is within the thickness of fabric. In Plane welding , most all the pieces is thinner. and meaning smaller electrodes, smaller filler wire, smaller torches…and in Plane and Aviation tig welding, a 1/16″ rod is taken into account fairly huge.