| for some time based on the oxidation on that surface. This would lead me to believe the seam of the seam welded pipe used by the factory wasn't fused properly. This would have resulted in much lower torsional rigidity of the pipe and caused some funny stresses to arise in the bend area after the seam delaminated. It's not surprising it broke the way it did. This is a quality engineering responsibility... if they weren't buying the material to a spec that ensured a properly fused seam their process was uncontrolled and its Stillens fault. If they were and the delivered material didn't meet the spec claimed, it would be the suppliers fault. Another possibility is that the seam would break every time, even if fused to spec as long as its oriented the way seen here. Meaning, the pipe was fed into the bender at an unfortunate clocking angle that doomed it to failure.
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