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Subject: Re: Alloy motor car & bike Radiator welding

Date: 03/28/03 at 11:43 PM
Posted by: portable welder
E-mail: alexweld@teleweb.net
Message Posted:

In Reply to: Alloy motor car & bike Radiator welding posted by Mick Fitch on 03/27/03 at 5:28 AM:

If what you mean when you say alloy is aluminum radiators here are my tips.
remove all the coolant,take a torch and heat it up, but dont get to crazy just heat it till you cant touch it, then take your die grinder and grind it clean, V-ee groove if neccessary,the key is clean it, what I found with sand blasting is that the silica in the sand penetrates the aluminum and slightly contaminates the weld,
The next step, if your tig welder has a knob on it that says cleaning on the one side and penetration on the high side you need to clean it,
Now turn your machine on and go over the area to be welded with the tig torch but do not try to weld it yet, you will notice alot of black on the aluminum you need to grind the whole area again untill its clean again, you may need to do this process one more time untill its clean enouph to weld. The tig welder is the best tool you can use to pull the contamination out of the aluminum.Remember that aluminum is like a sponge and will have oil or antifreeze in it even after its sand basted. Good luck I just taught you what took me a long time to figure out on my own. I can also be found at the welding forum on doityourself.com

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