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RE: [MW:6796] Propane or butane to preheat

By Materials & Welding
Nothing wrong in it, gas used for heating is not a variable to consider.

sent from my handheld
-----Original Message-----
From: eduardocalva@hotmail.com
Sent: 31/08/2010 12:00:40 am
Subject: [MW:6794] Propane or butane to preheat

Could all of you tell me the difference between preheat with propane
and butane?, If a WPS is qualified by preheating with propane but
butane is used in production welds is wrong?

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