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Message: <blockquote data-quote="jklingel" data-source="post: 40194" data-attributes="member: 1409"><p>I am pretty sure your cutting edge is T1-type, as A36 and the like would be too soft. Pre and post heating w/ T1-type steels is always recommended, as far as I know. 7018 is a tad higher tensile than 60XX and the flux coating (low hydrogen) is made for the "tougher" alloy steels. I would never weld anything as hard as a cutting edge w/ 60XX if I had 7018 around. Your pre and post heating should not be too localized, either, as that is exactly why you use a torch; the welding heats such a small volume that the weld and base metal shrink at different rates, then crack. You can also peen the weld as it cools, with a chipping hammer, which "pushes the weld out", reducing stress, as it tries to cool and shrink.</p></blockquote><p></p>