Have you ever experienced weld puddle shift?
Have you ever wondered why ASME BPE limits sulfur for tube and fittings to .005% to .017%?
Take a look at these videos, and you’ll understand why.
Clip 1 shows matched sulfur of .008% on both weld pieces.
Clip 2 shows mismatched sulfur of .002% welded to .014%. Notice how the weld pool tracks off-center of the tungsten. The pool tends to flow toward the material with the lower sulfur content. In extreme cases, the arc can completely miss a square groove butt joint when welding tube ends together.
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