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jerry42

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I want to weld a plate of 10gage CR steel to a 1/2 inch Hot rolled steel bar. Im TIG welding it. is there a specific filler rod I should use? i noticed that when I tacked it and applied a force to it it would crack on the weld itself. I used the filler that I use when I weld CR to CR. basic I have a friend who found a couple of pieces of what he thought was Wrought iron. But I think its Hot rolled steel bar. I made the mounting plates out of 10g CR.

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stingshp

Posts: 278
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Jerry
Sounds like used metal ,Grind your millcoating away along with rust . ER70-S6 if used metal ,or ER70-S2 if very clean ,1/16" Dia. rod. Wouldn't hurt to Chamfer plate edge .
A tack is just that a Tack weld with little Pennatration in base material .
What are you building??
GordonB

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unklian

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Did you grind the mill scale from the hot rolled bar ?

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jerry42

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I cleaned all the scale off. im building a sissy bar for a harley sportster. i asked the guy at the welding shop, he suggested using 309 stainless steel filler rod. anybody hear of doing that?

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stingshp

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Yes I have , Kind of a problem solver rod to use S.Steel filler rod .I've never looked Weld Schedule to see how strong it really is.
GordonB

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jerry42

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Yesterday I used the 309, It penetrated not real deep. maybe a little more heat would help. I took a look at the ESAB TIG welding hanbook.under the topic Welding dissimilar metals Hastelloy Alloy C to steel. use Hatelloy: Inconel: Nickel or 310 stainless. would Hot Rolled to CR be considerd 'Dissimilar metals? whats "Hastelloy"?

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