torque wrench???

[fullchisel]

ARC welding is ALOT of fun, but takes patience and alot of practice. I learned on an old 220/ 3 phase outfit...We were welding 1" peices of steel together

What is arc welding? Is it gmaw,smaw,tig,saw,fcaw.

 

[Al Smith]

Well,seeings this went from torque values to hard soldering,here goes.

When you "hard solder" you are actually expanding the molucules of the base metal and filling the spaces with the joint material.You can heat a piece of steel and actually draw the braze completely through it ,it comes out the other side just like magic.

Silver bearing joint material will take more of a shock load the straight brass compounds thus they are used in applications such as the joining of tooling blocks using carbide for machining aplication purposes.It is also widely used for refridgeration work as it will stand vibration and temperature variations much better than standard lead based soft solder.Now before you all get on the band wagon and rush right off to your local welding supply,a small tube of good grade refridgeration silver solder is around a hundred bucks,how 'bout them apples

 

[LarryTheCableGuy]

...You can heat a piece of steel and actually draw the braze completely through it ,it comes out the other side just like magic...

That's really interesting. I always enjoy Al's knowledge.

.

 

[RED-85-Z51]

I love brazing. I find myself all the time finding new uses for Brazing.

Recently, my dad and I bought an '81 Cadillac that was mechanically and internally mint, but had rustout around the trunk. Lots of little spots of rust,

So he cut out the big spots and welded in patches, but he used brass rod to fill in all the smaller, Dime sized holes and stuff. Got it done, ground it smooth with a flapper wheel on an angle grinder, then gave it a few thin thin coats of filler, and sanded that smooth with a DA sander, then a coat of Red Oxide primer. It looks totally perfect, I had a couple people over and dared them to find an imperfection in it, they couldnt. Water resistant and solid. Plus it was ALOT faster and cheaper than cutting out the whole panel and replacing it.

When I built my Gokart, I had 4 Rim halves, each with a Valve stem hole.

I put 2 halves together, and brazed one of the holes up on each rim, so far, its been totally air tight, because I dont use tubes. and they havent leaked down.

In small engine repair/Lawnmower repair, an O/A torch and brazing rods can be invaluable at times!

 

[Al Smith]

I might point out that for years,before the advent of the carbon fiber composite bicycle frame,they used 4130 chrome moly steel.The frame elements were joined with socket weld fitting that were in fact brazed,rather than welded as were many motorcycles.

The shear strength on a brazed joint is not too much but if I'm not mistaken the tensel is somewhere around 40,000 psi or more,depending on the alloy used.There are so many,I can't remember them all,aluminum bronze,silicon bronze,easy flow brass,AMPCO 18 equivelent etc.etc,etc.Confusing,to say the least.

 

[Lakeside53]

I've braised aluminum together very nicely with propane and HRT2000 rod.. Real nice and super strong. Didn't have nearly as nice a time on high magnesium content alloy though...


If you need to join a copper wire to aluminum extrusion, you can solder it with lead solder. The trick is to keep scraping the aluminum with a puddle of of lead solder until you have removed the "instantly forming" aluminum oxide and the solder puddle flows outwards. It will corrode long term, but..