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<blockquote data-quote="ntsqd" data-source="post: 27520" data-attributes="member: 222">First off, what ever you think a weld is, forget it unless you think of it as an 'on-site' casting because that's all it is. Boiled down to the bare essence it can't be much of anything else. I'm not talking about spin welding, friction stir, etc; I'm talking about a classic weld bead as made by a MIG, GTAW, Oxy-Fuel, etc. &quot;As cast&quot; it may be stronger or weaker than the base metal, there are too many variables to generically predict which it will be. It is only in the post weld handling and treatment of the structure that the weld metal becomes closer in grain structure and properties to the base metal. The higher the alloy, the more post weld processing is required or at least should be done for optimum strength, ductility, etc.Usually welds done with no filler and no allowence for extra material in the base metals loose section thickness.&quot;People dont use strips of mild steel as filler rod, so the weld will never be the same composition as the base metal....&quot;Experienced aluminum body builders shear a strip off the body material and use it as filler. Even then it isn't exactly the same because of the different heating and cooling cycle(s) it's been thru.TS&quot;It only seems kinky the first time&quot;-- Bumpersticker seen in Lost Wages</blockquote>

[QUOTE="ntsqd, post: 27520, member: 222"] First off, what ever you think a weld is, forget it unless you think of it as an 'on-site' casting because that's all it is. Boiled down to the bare essence it can't be much of anything else. I'm not talking about spin welding, friction stir, etc; I'm talking about a classic weld bead as made by a MIG, GTAW, Oxy-Fuel, etc. "As cast" it may be stronger or weaker than the base metal, there are too many variables to generically predict which it will be. It is only in the post weld handling and treatment of the structure that the weld metal becomes closer in grain structure and properties to the base metal. The higher the alloy, the more post weld processing is required or at least should be done for optimum strength, ductility, etc. Usually welds done with no filler and no allowence for extra material in the base metals loose section thickness. "People dont use strips of mild steel as filler rod, so the weld will never be the same composition as the base metal...." Experienced aluminum body builders shear a strip off the body material and use it as filler. Even then it isn't exactly the same because of the different heating and cooling cycle(s) it's been thru. TS "It only seems kinky the first time" -- Bumpersticker seen in Lost Wages [/QUOTE]

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