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Tool Talk Discussion Forum

Re: Peening welds

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Stick welding

03-20-2013 16:08:25

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No, a sharp chipping hammer shouldn't be used for peening. A dull chipping hammer would be a better choice and the idea is not to beat the snot out of the weld. That will increase stress rather than reduce it. Peening is supposed to reduce shrinkage stress while the weld is cooling. They make low stress stamps that are a series of dots because on critical jobs using standard stamps to identify who did the welding can be stress risers and/or a starting point for a crack.

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03-20-2013 18:19:46

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 Re: Peening welds in reply to Stick welding, 03-20-2013 16:08:25  
I didn't say sharp I said pointed and I guess I could have been more clear and said rounded or dull pointed end , I have welded many cast housings cold with nickel without a failure .

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03-20-2013 20:19:14

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 Re: Peening welds in reply to el6147, 03-20-2013 18:19:46  
Do you weld it across the crack as was suggested to me? I guess there's more than one way of doing things.

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03-21-2013 09:34:42

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 Re: Peening welds in reply to IrvIA, 03-20-2013 20:19:14  
I would guess everyone has their own way or technique , often one learns by doing and I don't believe there is one set of rules when it comes to cast . Often I v-groove , small holes and each end if it is a crack so the crack does't continue , single pass in the groove making sure all flux is cleaned out before your next short weld is started and I do what I would refer to as a side to side Z pattern on the cover pass or when the opening begins to widen as you stack weld on top of weld as your filling the V-groove and the absolute perfect way to weld cast is oxy-acetylene with a cast iron filler rod with cast flux and that one can only learn by doing .

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Stick welding

03-21-2013 22:16:39

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 Re: Peening welds in reply to el6147, 03-21-2013 09:34:42  
Spray welding is also one of the best methods to repair cast as is brazing. Stick welding is just fine for some cast iron repairs.

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Stick welding

03-20-2013 19:41:05

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 Re: Peening welds in reply to el6147, 03-20-2013 18:19:46  
A rounded chipping hammer will work but I've always read that over peening is worse than not peening at all. Reading some of the posts makes it sound like your supposed to beat the living daylights out of the weld, which would over peen it.

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