Heat & quench method
Heat & quench method
(OP)
I am currently in Panama City, Panama Building a museum By Frank Gery.
The col.s for one of the roofs are covered with a concrete pour, so in order to set the embeds which are welded to the col.s with 1" plate approx. 3'x 1' Makeing a "T" connection The embeds them selves are 2'x3'x1 1/2" the embeds are only 3mm-8mm in offset so to move them with out cutting or other destrugtive methods we began to heat and quench areas to move the embeds which worked just fine but the inspetors said that is not acceptible because we are changeing the tinsel strength of the steel and must submit an R.F.I to the engineer. My question is at what temp does mild steel begin to change? I know it does but not at the temp I am subjecting it to.
The col.s for one of the roofs are covered with a concrete pour, so in order to set the embeds which are welded to the col.s with 1" plate approx. 3'x 1' Makeing a "T" connection The embeds them selves are 2'x3'x1 1/2" the embeds are only 3mm-8mm in offset so to move them with out cutting or other destrugtive methods we began to heat and quench areas to move the embeds which worked just fine but the inspetors said that is not acceptible because we are changeing the tinsel strength of the steel and must submit an R.F.I to the engineer. My question is at what temp does mild steel begin to change? I know it does but not at the temp I am subjecting it to.





RE: Heat & quench method
RE: Heat & quench method
Heat is used for two reasons - one is to reduce the yield strength of the material to allow it to deform easier along with using thermal stresses to help move the material and induce residual stresses during cooling. I would favor spot heating followed by forced air cooling.
Your inspector is correct and based on what you described the Engineer should be involved to evaluate your technique.
RE: Heat & quench method