Interpass temeprature is measured between complete of one pass and before start of next pass and normally the interpass temperature shall be maintained between min specified preheat and max limits of interpass .Whenever low interpasses are required it is better to allow more time lapse between the passes and we normally do not measure the temperature of the bead during welding and I hope it is not specified any where in the codes.
To control colour tint may be other parameters also looked into.such as trailing gas flow etc to keep the wled zone free of any oxidation and also it provides the cooling effect also thereby the colour tint may be reduced .
Best Regards,
Francis Lobo
----- Original Message -----
From: claes gillenius
To: materials-welding@googlegroups.com
Sent: Mon, 15 Dec 2008 22:39:51 +0530 (IST)
Subject: [MW:1404] Re: Interpass temperature measurement.
When we test electrodes / weld metal
properties / here, we interpret interpass temp. as the max. temp. when
a new pass can be started. We do continue with the next electrode directly
after the first regardless of temp. I.e. we measure interpass temp before
starting the next weld bead. However, we do not weld titanium, so I understand
there may be a problem in that case.
Claes Gillenius
Development Engineer, MMA. (Spec. stainless and non Fe-alloys)
Direct tel: +46 (0)31 509315
Mobile +46 (0)707532012
Company ESAB
AB
Address
Box 8004, 402 77 Gothenburg, Sweden
Lindholmsallén
9
Company reg number 556005-7738
| kataiah@bilfal.com Sent by: materials-welding@googlegroups.com 2008-12-15 04:06
|
|
Dear Friends,
I have a confusion regarding the measurement of interpass
temperature.During GTAW welding of Titanium material, interpass temperature
should be maintained very low to avoid oxidation (Blue color formation).
When weld length is more, the moment welder starts welding interpass
temperature exceeds the specified limit. Before welding with next rod,
interpass temp will be higher than specified but generally we won't
stop welding until total run or weld length is completed.
Please advise me when to measure interpass temperature.
Regards
P.K
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