Welding to 1 3/4" Thick Flange

[MtnManBob]

Hi guys, have a project where will be welding to flange of existing W 12x190 column. Has a flange thickness of 1 3/4". Will that welding require preheat?

 

[ATSE]

Most likely yes.
See AWS D1.1. Chapter 3

Before you get started, you need to ask: What grade of steel? If you don't know, assume the worst (higher grade / category).

 

[Duwe6]

D1.1 'generic' preheat = 150°F at 1.5", and 225° at 2.5".

a hundred-and-a-half at an inch-and-a-half

 

[MtnManBob]

drawings are dated 1982. no specs available but general notes say A36. Hopefully specs and notes agreed. Have seen before where they didn't.

 

[ATSE]

Avoid double posting the same question in different forums. If you can't resist, note the other forums you've posted your question in.

 

[connectegr]

Whether A36, A572-50, or A992, preheat is required. Depending on the welding process and material grade the preheat is 150*-225*. If you are not sure the material grade I suggest the higher preheat/interpass temperature minimum.

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