Update: The difference a proper pre-heat makes on 2-inch thick A516 plate

We had to weld a new section into a boiler drum at the plant in Gary. First attempt, we just went at it with the stick welder, no pre-heat. The bead looked fine but we got a nasty crack in the HAZ after it cooled. Boss made us stop, get the rosebuds out, and bring the whole area up to 250F before we tried again. The second weld went in smooth, and after a full cool down, the X-ray passed with no issues. Anyone have a good rule of thumb for pre-heat temps on different thicknesses?

2 comments

2 Comments

jenny_carr522d ago

Science experiment" is a nice way to put it. Did you guys check the actual chemistry on that plate, or just go by the thickness?

charlie2692d ago

So the first try was basically a science experiment.