[SEL] heating large castings for welding

Dickie reb at apex.net
Sun Jan 29 13:25:23 PST 2006


I have also heard for repairing large pieces of building a fire, either wood 
or charcoal around the piece and once hot remove it from the fire and repair 
it and then returning it to the fire and let it burn out and cool.

Dick Bauer
----- Original Message ----- 
From: "John Hall" <jthall at worldnet.att.net>
To: <sel at lists.stationary-engine.com>
Sent: Sunday, January 29, 2006 2:41 PM
Subject: [SEL] heating large castings for welding


> Did something a couple of weeks ago some of you may find helpful. If you 
> have ever tried welding or brazing castings you know and understand the 
> necessity of preheating and slow cooling. If its small use a torch for 
> heating and bury it in a sand pile to let it cool slowly. I've heard of 
> doing mid-sized parts by initially heating on a barbecue grill as well as 
> putting them back on for controlled cooling.
>
> I got hold of one to big for either a couple of weeks ago. I had to weld 
> up a transmission housing that measuered roughly 1 x 2 x 3 feet. First off 
> it was very greasy so I sent it to an automotive machine shop to be 
> cleaned. To initially preheat it I used one of those torpedo shaped 
> kerosene heaters like you see used on construction sites. I heated the 
> part for about an hour until you couldn't touch it by hand. Then we used 
> the rosebud to finish preheating the area to be welded. After welding I 
> put it back in front of the heater for another hour to equalize the temp. 
> Nothing went CRACK!!! so I assume all worked well.
>
> John Hall
>
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