Someone mentioned MIG brazing to me in an email and I thought he was a loon....untill I read this lot!
Link 1
link 2
Link 3

Interesting stuff- cheers for the links!

James

very interesting...... bit late for doing my floor tho....

so brazing, i always thought it gave a stronger joint that welding, perhaps with this its not quite true but ........

mig brazing ali ????? this technique doesn't melt the parent material so with a different wire would it work ?????

Sounds very interesting.
If anyone finds a source of MIG brazing wire please give us a shout.

Dave

Very interesting. The last article implies that using a standard MIG is likely to give problems with the wire feed sinces the wire is so soft. They are obviously pushing the Fronius inverters, but I'm wondering if an inverter is actually quite important to the process. The guy who wrote the first article mentions that

"The bead left by MIG brazing is not like a nice weld bead. It puddles and balls which easily grinds down"

whereas the last article says that the process makes very neat joins with no spattering.

We get our wire from Wellington Welding, £70.50 +VAT a roll. We use pure argon and the 'welds' are strong. Vauxhall and others now insist it used on their newer cars due to the HSLA steel used, it doesn't like being heated up too much!

Whats a roll, 15kg or more???? or to put it another way, what does .8mm wire cost a roll?

Just thinking that it sounds blooming expensive.

Thats for a 15Kg roll, you also need a teflon liner

I've seen it in some groups I read but I thought it was more for panelwork than stress bearing members as it puts less heat into the weld to preserve the rustproof coating.

ther starting to use micro alloy steels in car production, which are much stronger than mild(its to save weight) so thats proberly why as you cant heat it to much with out ruining the heat treatment.
brazeing will still burn of the galvaniseing cos zinc melts alot lower than bronze.
£75 for 15kg sounds a prety good price to me! i reacently brought some silicon bronze filler wire for Tig welding(works for Tig brazeing to) £36.80=vat for 2.5kg! i should take up drugs think ther cheaper LOL
to put it in perspective i pay around £3 /kilo for bronze ingot.
im planing on Tig brazeing my frame,its certainly strong enough.and it saves on electricty!
as for Mig brazeing ali dont know if it would work coz the braze doesnt flow and wet out the metal like brazeing steel.

[Edited on 29/10/04 by malakiblunt]