Lets say for a pipe that will be under pressure, one is oxy fuel welded with a large HAZ (heat affected zone) and one it zipped up, down hill, or up hill, with any other common electric process.
Now does a pipe that has been heated like in oxy fuel have better resistance to weld or HAZ cracking because the entire joint, plus or minus a few inches to either side of the HAZ, has all been heated together?
Does a small heat affected zone from an electricity based weld provide less uniformity to flexing of that pipe in cases of earthquakes or movement?
Does the Large area of heating help disperse any possible hydrogen that could be in there?
Thanks everyone!
Jordan