Welding Preheat

This video goes over when, why, and how to use PREHEAT when welding. Thanks for watching & subscribing to TVWeld!
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[@johnkizziah108]

The two big reasons for pre heat are hydrogen entrapment and thermal shock. Good job buddy

[@chetantomar6487]

Excellent ... Thnaks !!

[@Stavrakasgr4]

Thank you so much for the info. Great content❤️

[@JonDingle]

When l preheat l only use a propane open flame because oxy acetylene is really expensive here in the UK. If l get a small cast iron part l could pop it into my welding rod oven overnight.
Would you say 250degrees C is enough for most jobs or should it be higher for say grey cast iron? Is there are table of temperatures available for preheating metals prior to welding?
Top stuff again young man!

[@TVWeld]

I do the same thing if the part is small enough. I typically try to get the preheat on cast iron around 500 to 600 degrees F. so around 250 to 300 degrees C I'd say would be fine. If I look for official preheat temperatures in say a table, I always look in the appropriate AWS welding code. Thanks.