moving before the puddle freezes. That creates a “wagon track” — a groove full of slag and porosity. Wait until the red glow fades to black. 5. The Great Debate: Art or Crutch? Among welding purists, puddle welding occupies a strange moral category.
In the 1930s–50s, many steel bridges and industrial structures used as a repair for corroded gusset plates. The American Railway Engineering Association had a standard for “puddle welding of fatigue cracks” — essentially depositing small, overlapping beads to arrest crack growth without heat-straightening the member. puddle welding
Then, on the 15th attempt, you will see it: a clean, flat, slightly overlapping series of dimes. No undercut. No slag traps. Just solid metal where a hole used to be. moving before the puddle freezes
If you have a ½-inch hole in 1/8-inch steel, a continuous bead would fall through. But by building overlapping puddles from the edges inward — like a spider weaving a web — you can “cap” the hole. The first puddles freeze to the edge; subsequent puddles freeze to those puddles. After 20 or 30 deposits, the hole is solid. In the 1930s–50s, many steel bridges and industrial