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Up Topic Welding Industry / Technical Discussions / D1.6 minimum preheat
- - By SWN1158 (***) Date 05-30-2019 16:58
Under "Prequalified WPS Requirements", 3.29 (3) states "The minimum preheat shall be sufficient to remove moisture from the work, unless other means are used to keep moisture away from the weld puddle area."

5.1.2.1 states "Preheat temperatures shall be sufficient to remove moisture from the joints to be welded, as a minimum. Specific preheat and interpass temperatures are largely dependent on the material types and thickness to be welded. Both preheat and interpass temperatures shall be in accordance with the approved WPS or as otherwise specified or approved by the Engineer."

But, Table 4.1 "WPS Qualification Variables", 6.3 states "A decrease of more than 100°F [55°C] in the preheat temperature qualified. The minimum temperature for welding shall be specified in the WPS."

I'm having trouble locating what the "minimum temperature for welding" is. D1.6 seems to be less clear than D1.1 with regards to a minimum "temperature for welding", and according to 6.3 in Table 4.1, this is something that must be shown on the WPS.

Where can I find this information? We're welding 304 to 304 and 304 to 316L.
Parent - - By 803056 (*****) Date 05-30-2019 18:47
It isn't customary to preheat austenitic stainless steels before welding unless the surfaces are wet. In that case, the preheat required is only to dry the surfaces to be welded.

Al
Parent - By SWN1158 (***) Date 05-31-2019 01:16
Ok. Thanks! You da man!!!!
Up Topic Welding Industry / Technical Discussions / D1.6 minimum preheat

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