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Pre Heating of Welding Pre Heating of Welding Pre Heating of Welding
Pre Heating of Welding
Pre Heating of Welding Pre Heating of Welding

Pre Heating of Welding

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Pre Heating of welding is done before start of welding and along with welding so that the temperature gradient is maintained constant and there is no sudden contraction and expansion of metal before and after welding. Pre Heating also referred to as PH also helps to improve weld ability of steel.


The temperature at which to preheat is determined by the mechanical and physical properties of the metal to be welded and electrode being used. All the data including the initial temperature and interpass temperature is specified in the WPS and has to be followed if desired material characteristics like hardness, weld ability, etc. are to be obtained.


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