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[MW:2672] RE: 2666] colour of fillet welding

By Materials & Welding
As you may be aware, the colors to which you refer are commonly known as
"temper colors", and are determined by the thickness of the oxide scale
that has formed on the surface during exposure to air at high
temperatures. In the case of submerged arc welding, the variations in
color you have observed are probably due to variations in the following
combination of factors:
- heat input per unit length of weld
- thickness and width of workpiece
- length of time between completion of weld and removal of slag

Together these would primarily determine the temperature-time profiles
to which the weld surface is exposed to oxygen. See attached chart for
further detail.

Robert W. Warke, P.E.
Associate Professor of Welding & Materials Joining
School of Engineering & Engineering Technology
LeTourneau University


-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of rohit rawat
Sent: Sunday, July 12, 2009 8:24 PM
To: Materials & Welding
Subject: [MW:2666] colour of fillet welding


Hi there, can anyone please tell me that in submerged arc welding, why
does sometimes the colour of welding many timesd comes blue and
sometimes it comes yellow. the steel we use is ASTM A572 Gr. 50
Type1 .Thanks,

Rohit Rawat.
Asst. Engineer
(Quality Assurance),
Kirby Building Systems,
Haridwar.

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