TWI's preheat toolkit uses the methodology outlined in BS EN 1011-2 (March 2001) to determine the required preheat temperature for welding C-Mn and low alloy steels to avoid fabrication hydrogren cracking. The toolkit is alsodesigned to determine any of the required welding parameters (preheat, carbon equivalent, joint configuration and thickness, hydrogen content and heat input), providing the other four factors are known.
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