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QW- 406.4

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newweldeng09

newweldeng09

Mechanical
Joined
Oct 31, 2008
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Can the minimum temperature for welding be below the preheat temperature?
 
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In general yes. 100F below the preheat used and documentsed on the PQR and it must be specified in the WPS.
 
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Agree with stanweld. You are limited to 100 deg F or less change in minimum preheat temperature without having to re-qualify a WPS.
 
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Should have added, unless the mandated Code of Construction or Contract specifies a minimum preheat temperature.
 
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