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Posted by: mrpool ®

03/14/2007, 18:08:55

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I own an aircraft and was just notified of a 2 ½ crack in the block, independent of any screw holes. I asked about welding and was told: the block acts as a heat sink even using a torch with the wilding the block did not get hot enough. Can Laser welding do the trick?







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Re: laser welding
Re: laser welding -- mrpool Post Reply Top of thread Forum
Posted by: CCR5600Design ®

03/15/2007, 09:18:57

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I assume you are speaking of the engine block. If this is the case, I have good news and I have bad news. The good news is the block CAN be repaired. You did not mention if the block was aluminum or if it was cast iron, but in either case, yes it can be repaired.

Now for the bad news...

Regardless of the material it is made, you will have to disassemble the engine for a proper repair. If the block is manufactured from cast iron, you will need to bring the block up to a temperature of about 600 degrees in an oven (I have seen this done) with the block in a bed of sand to maintain a constant temperature during the welding process. Due to the heat and welding, distortion may occur and the block will need to be checked for squareness and at the very least have the cylinders, camshaft journals and main bearing journals checked for alignment and line-honed or bored as needed. If the block is aluminum, a comparatively easy process with a tig welder will fill the bill.

Hundreds of vintage and irreplaceable engine blocks and cylinder heads have been repaired successfully by welding them. Sometimes, however, it is cheaper to buy a new block or cylinder head.


Ron





"What we need are more people who specialize in the impossible." - Theodore Roethke


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