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Pennsylvania Weldor · 05-18-2008, 01:03 PM

One more input. The area that failed is called the "Heat Affected Zone". That's the area adjacent to a weld that is most likely affected by the welding heat, thus changing it's makeup. Temperature at the arc can reach up to 12,000 degrees F. The grader blade you welded is heat treated (hardened) throughout the entire thickness of the metal. Welding altered that area, and thus it failed.
Preheating was the way to go, "Lo-Hi" (low hydrogen rods - low moisture content in the flux coating) rods were also the way to go. 7018 or even stronger rods like the 8018, 9018, 10018 could have been used also.
Slow cooling like you did was good also. Hope it holds up now. Happy splitting (logs that is).

05-18-2008, 01:03 PM	#12 (permalink)
Pennsylvania Weldor Member Join Date: Mar 2008 Posts: 48	Re: Welding help needed One more input. The area that failed is called the "Heat Affected Zone". That's the area adjacent to a weld that is most likely affected by the welding heat, thus changing it's makeup. Temperature at the arc can reach up to 12,000 degrees F. The grader blade you welded is heat treated (hardened) throughout the entire thickness of the metal. Welding altered that area, and thus it failed. Preheating was the way to go, "Lo-Hi" (low hydrogen rods - low moisture content in the flux coating) rods were also the way to go. 7018 or even stronger rods like the 8018, 9018, 10018 could have been used also. Slow cooling like you did was good also. Hope it holds up now. Happy splitting (logs that is).