Mig & Brazing

[GeorgiePorgie]

Been having a scan through the photo albums and came across Matt1978 photos.

He brazed some thin sheet metal....
http://www.mig-welding.co.uk/forum/album.php?albumid=774

Few questions,thanks.....

Is this possible on all Migs?
How hard is it to braze with the mig?
Is it the same technique as welding mild steel?
What settings is needed?

 

[pedrobedro]

Read this and decide for yourself whether to have a go. The welder in your illustration has a special program for brazing and a price to match it's quality.

 

[GeorgiePorgie]

Oh well,thats put that one to bed then

 

[Engineer]

MIG sets designed for brazing work very well indeed, but price is way beyond most DIY users.

 

[aametalmaster]

Is this possible on all Migs?
How hard is it to braze with the mig?
Is it the same technique as welding mild steel?
What settings is needed?

Yes you can use a regular mig. I have been doing it for years with my Miller MM185 mig and 100% argon. You need a larger gap than welding steel and not very much heat...Bob

 

[200T]

Yes you can use a regular mig. I have been doing it for years with my Miller MM185 mig and 100% argon. You need a larger gap than welding steel and not very much heat...Bob

Great! I'll give that a try... I have a badly cracked exhaust manifold to fix, and MIG brazing seems like the awnser to that problem...

Regards,
Jan

 

[aametalmaster]

Great! I'll give that a try... I have a badly cracked exhaust manifold to fix, and MIG brazing seems like the awnser to that problem...

Regards,
Jan

I tried it on an exhaust manifold off an old farm tractor and it didn't work at all. But on sheetmetal its great...Bob

 

[squazy84]

ive used mig braizing to repair a cast iron manifold and it worked (it does not leak) which is what you want i expect, it wasn't pretty but iirc i did it with a nasty gassless mig (i suggest you use argon lol point is that was a year and 3 k miles ago and the weld is still there! i got the brazing wire on ebay

 

[aametalmaster]

I have some cast iron mig wire but it isn't cheap and would be perfect for that job...Bob
http://www.crownalloys.com/TechSheet/CAST_IRON_ROYAL_44-30_w_New_Warning.pdf

 

[200T]

I have some cast iron mig wire but it isn't cheap and would be perfect for that job...Bob
http://www.crownalloys.com/TechSheet/CAST_IRON_ROYAL_44-30_w_New_Warning.pdf

That is VERY interessting! It looks like cast iron mig wire is totaly unknown on this side of the atlantic, after a short google session.

Can you perhaps give me a rough figure on the price of that wire?

Regards,
Jan

 

[octo0072000]

well i have over many years welded exhaust manifolds with normal mild steel mig wire in fact the last one is still at the bottom of the garden off a 2.8 Pajero,
before i replaced the Turbo with a s/hand Turbo came with the exhaust manifold otherwise it would still be on there just grind it well and groove it if it works ok if not you need to find another i welded mine in situ better if its off
you can weld cast with arc weld and cast rods

 

[aametalmaster]

That is VERY interessting! It looks like cast iron mig wire is totaly unknown on this side of the atlantic, after a short google session.

Can you perhaps give me a rough figure on the price of that wire?

Regards,
Jan

I paid $75.00 for a 2 lb spool...Bob

 

[200T]

Ok, that's not cheap.... Brazing wire is about a third cheaper here, I think I'll give that a go. Thanks for your reply!