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Field welding[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Field welding
- From: "dave lowen" <jatech(--nospam--at)kwic.com>
- Date: Thu, 8 Sep 2005 17:25:43 -0400
This is a note on the contract drawings I am quoting from;
“Field welding to existing structural steel.
Prepare serfaces (sic) of existing steel for welding by removing all paint and grinding clean to white metal.
Preheat to a minimum of 200 degrees F. in order to control the cooling rate.
Permissible welding stresses shall be taken as only 50% of normal allowable stresses when welds are performed in shop.”
For starters, the cooling rate is controlled by postheat, not preheat.
Secondly, I am assuming when the EOR says “allowable stresses”, s(he) means allowable weld values.
My questions are; can an engineer mandate pre or post heat for welds that only require the material to be at ambient temperature according to AWS?
And, can an engineer mandate a factored allowable weld value when the code allows full values for field welds.
V 519 587 5797
F 519 587 5138
V 519 749 9468
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