grant 40 Posted November 22, 2019 Share Posted November 22, 2019 I have a cracked alternator bracket, its cast and has been welded already. Its been suggested that further welding isn't likely to be that great. Tired the Engine Room but they have a different bracket and don't have any suggestions on this one. Thought I would try here before getting something made... Quote Link to post Share on other sites
Island Time 1,235 Posted November 22, 2019 Share Posted November 22, 2019 Send it to Rocky at the Auckland Welding School. A decent weld will work.... Quote Link to post Share on other sites
Guest 000 Posted November 22, 2019 Share Posted November 22, 2019 IT is correct. Cast iron is difficult to weld. For a start you need the right electrodes - I have seen people using standard mild steel electrodes on cast iron with predictable results. Could be wrong here but from memory it is desirable to heat the workpiece red hot prior to welding as this ensures good infusion into the repair. But a man at a welding school will know all this of course so I think you can have confidence in his repair. Quote Link to post Share on other sites
vic008 17 Posted November 22, 2019 Share Posted November 22, 2019 Who said it was cast iron? Quote Link to post Share on other sites
Guest 000 Posted November 22, 2019 Share Posted November 22, 2019 Who said it was cast iron? The OP describes the fractured bit as cast, the Bukh engine specs describe the engine block and attachments as manufactured from 'high grade cast iron alloy. ' Quote Link to post Share on other sites
Frank 157 Posted November 22, 2019 Share Posted November 22, 2019 IT is correct. Cast iron is difficult to weld. For a start you need the right electrodes - I have seen people using standard mild steel electrodes on cast iron with predictable results. Could be wrong here but from memory it is desirable to heat the workpiece red hot prior to welding as this ensures good infusion into the repair. But a man at a welding school will know all this of course so I think you can have confidence in his repair. I looked into this type of repair for a volvo part and even purchased the rods at $36 each !. They have a very high nickle content hence the $ On you tube the technique seems tricky with pre heating and cleanliness critical even in experienced hands there was a risk of cracking as the Cast iron cooled. Brazing seems less technique dependant with good results I recall my fathers bench vise soldiered on for many years after being over tightened and snapping in two. Quote Link to post Share on other sites
Island Time 1,235 Posted November 22, 2019 Share Posted November 22, 2019 Rocky is a great guy, owns the Auckland welding school, and a sailor. If you dont want to send it to Auckland, give him a call. He knows most of the decent specialist welders (trained many of them) and I'm sure he'd recommend someone closer to you if required. Quote Link to post Share on other sites
grant 40 Posted November 23, 2019 Author Share Posted November 23, 2019 Thanks Rocky is a great guy, owns the Auckland welding school, and a sailor. If you dont want to send it to Auckland, give him a call. He knows most of the decent specialist welders (trained many of them) and I'm sure he'd recommend someone closer to you if required. Quote Link to post Share on other sites
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