arc welding exhaust manifolds 3

[9627]

Hi all,have a question for the community here.Have joined an exhaust manifold back together after cutting an inch out so it'll fit between the tractor bonnet and front end loader. So I had some (3) low hydrogen rods of 2.5mm Dia. and stuck it together with 105 Amps at 75 volts. It has stuck and I neglected to peen the weld area due to concerns about brittleness .Keeping costs low because its a hobby job (fitting the loader) while I'm unemployed to keep the brain and spirit active....
Google search the subject revealed no answers unless using MIG . Your input will be happily received. Cheers.

 

[berkshire]

If it stays stuck dont touch it.
If this is a cast manifold you would be better off using a high nickel filler rod about 55% enough to do your job. If it breaks again, look for cast iron welding rods. enough to do the job should cost you about $15.
B.E.

The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor

 

[metengr]

9627;
Peening is not really going to help or matter in this application. If the weld held together, success.

 

[9627]

Hi berkshire(B.E.)& metengr. Thank you for your valued opinions on the topic,very much. It has held and it is appeasing to the conscience hearing that peening is as stated in this application. I appreciate being included the knowledge which rod type should have been preferred for future reference in case my job lets go! In some respects I guess; I now know where to find the formula for fixing my manifold.(Although I'd prefer to cast a new from the dodgy pattern that now pretends to be suitable).Just hoping it stays put.9627.

 

[SectionIX]

75 volts?

 

[9627]

Well SectionIX on the Peerless Dual Voltage arc welder(1Ph.+3Ph.) it says special electrodes on the 75V side and I was uncertain about using LoHydrogen or cellulose ,couldn't remember anything about it and locally was told "you cant weld cast,throw it away" so I had nothing to lose & was getting no help?
if it packed up the next step would be a pipe bend and 10mm mild steel flange.So I figured higher V lowers the Amperage and gives a faster deposit at less heating of the parent metal.... seems to have glued!ACTUALLY its not bad looking I was concerned about crystallization of the weld area. If there had been a note from this forum about that, it would be best to prepare a replacement and wait for the break to occur.What were your thought about the voltage ....besides 'what th F*@#..??' and thanks for your attention to detail?

 

[9627]

SectionIX, Having read my reply to you I trust you wont get the wrong impression from my WTF which meant to indicate YOUR reaction to my 75V. selection? NO REFLECTION ON YOU! Thank you for your interest in replying,9627.