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My foreman said to always preheat the 4130 before welding the header flange.
He told me last month on the job in Spokane. I skipped it once to save time. Cracked right along the heat line after a single pressure cycle. Cost us a full day to cut out and redo. Anyone else had a weld fail from rushing the preheat?
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hart.mark6d ago
Thought it was overkill until I saw that crack.
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kim1916d ago
My old house had the same problem, a tiny crack that cost thousands to fix.
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