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Old 04-24-2010, 09:06 PM
kicking kicking is offline
Motorized Bicycle Elite Member
Join Date: Apr 2010
Location: mississippi
Posts: 403
Default my closing thoughts and comments on frame repair we

my closing thoughts and comments on frame repair welding and composites and I am sure there are others / is as follows . Welding is dangerous , a live mentor is a must for a green horn like me , to have the knowledge of how to forge steel as an need to is a great idea .. My thought is this , I knew an old man when I was young that had an old 1946 ford tractor that ran until he died at the age of 79 , (he forged his own parts) where else can you get parts right ? and he loved his tractor like a child he could never have .. If yall see fit to keep this post going I will be here when I can. We have a lot of bad weather here in Mississippi tornados and such .. One thing is back when old leaman lived , pennies where made of copper not zinc .. Now saying that .what you have in your hand may not steel or is it coated or well get the picture ?ugggg sigh Sometimes stumps the best // later
Originally Posted by 42blue15 View Post
Assuming you can get a welder to do it, the easiest way to make a good frame is to braze steel tubing. Steel tubing is easy to braze or weld, but welding thin-wall tubing tends to burn off some of the wall thickness opposite the welds, so brazing usually ends up being stronger.

Aluminum can be welded and brazed (with Durafix rod) but it is much more difficult than steel, because of the way that heat spreads out quickly in aluminum. Also some people have found that aluminum brazing rod does not hold well if it gets flexed at all.

Galvanized steel is never good for structural metal use for two reasons. First reason is that the zinc coating burning off while you are welding it is a health hazard, and second is that the chemical bath necessary to apply zinc coatings weakens the surface of the metal. So no good-quality steels are ever normally zinc-plated. Electrical conduit is steel, but it's a very low-grade soft steel.

In the US the main two metals to look for are 4130 cro-moly steel and 6061-T6 aluminum. Mild steel can also be used, but it is not quite as stiff and resilient as 4130 steel would be.

Anything else is either too weak (cast iron pipe) or a lot more expensive (stainless steel, titanium, ect). ....And aside from simply costing a small fortune, stainless steel and titanium are also very difficult to cut, drill and weld properly.
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