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Stress
Relief
Heat
Treatment
of
Weldments - By and large the problem of welding stresses did not assume serious proportions until large structures were made by fusion welding. While unwanted internal stresses can lower the endurance limit of individual parts, these failures were not so spectacular, even disastrous, as a broken penstock, a collapsed bridge, a cracked ship or an exploded gas sphere.
Suspicion extended to the weld itself; it was known, for example, that certain thin sheets could be welded with a sound joint, but that heavy plates of the same composition would likely have microcracks, due presumably to localized, overpowering residual stresses at the weld.
It is not strange, therefore, that the welding fraternity has been fore most in studying this phenomenon of high stresses (not due to the calculated working loads) and in devising methods for correcting or alleviating it.
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