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Do you actually get out weld on occasion? The point is, who at home doing the usual array of welding projects is going to pull out a torch and preheat a weld joint to 250F, stitch it, heat the next one, keep moving... if they can actually even control it to 250F, maintain uniform temp across the whole weldment so it doesn't warp... You can pull codes and pictures until you're blue in the face; I'd prefer thorough penetration of the metals to make a proper structurally sound weld joint. I give you the exception in the 3/4" thick + thicknesses you refer to, but most machines like the 251 are more than up to the task for 1/2".
While you're at it, pull up the section on how to do a proper scratch test so we make sure we have not exceeded Rockwell C27.
Where we get in trouble here is the guy thinking he can successfully make multiple passes with a 110 mig when welding the tounge of his car trailer to the main frame of it and that gets scary when its done in a fashion where the bead never gets hot enough and the weld is most likely cold, because the box doesn't have the nads to begin with.
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'84 Carrera Coupe
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