Pipe Welders and Boilermakers use a Tig welding approach known as the “lay wire” approach.
What it means is that the tig welding filler wire is held within the weld puddle on a regular basis as an alternative of being dipped out and in as will conventional tig welding strategies used for sheet metallic.
Pipe welding is totally different from sheet metallic welding and pipe welders are a special breed than those that weld sheet metallic.
For one factor, Pipe welders typically use a way generally known as “strolling the cup”. This can be a approach that works particularly effectively for pipe and never an entire lot else.
Aerospace welders, motorsports welders, sheet metallic welders, and most different job store tig welders don’t discover a lot use for strolling the cup. However the lay wire approach will be helpful for many jobs.
Any tig welding job the place the thickness is greater than 1/eight” inch or.125″…or about 3mm would possibly have the ability to be completed utilizing this technique. Particularly if pulse parameters are used.
A observe of warning: There may be at all times a threat of lack of fusion whenever you use this method on fillet welds as a result of leaving the rod within the puddle can chill the puddle and might conceal the vanguard of the puddle making it troublesome to make sure correct fusion all the way in which into the foundation.
I’ve heard of latest failures in socket welds the place lack of fusion within the root was a contributing issue to the failure and socket welds are fairly often welded utilizing the lay wire technique.
However a socket weld on an influence plant that goes by means of thermal mechanical fatigue is far totally different bracket on your headers on a sizzling rod mission.
So the underside line is that this: use the lay wire technique scrupulously. Like when aesthetics are the vital factor. When absolute full fusion is required all the way in which down within the root of a fillet weld, the dip technique guidelines.