wheeleymaster99 Posted January 12, 2004 Report Posted January 12, 2004 anyone know what stock and after market a-arms are made of? like what kinda steal Quote
Wallrat Posted January 12, 2004 Report Posted January 12, 2004 Stock ones and the cheaper aftermarket variety are made out of mild steel. The nice aftermarket ones are Cro Moly or (lemme see if I can spell this right) Chrome Molybendum. Cro Moly is a far superior material. Quote
Cotton eyed Joe Posted January 12, 2004 Report Posted January 12, 2004 Stock ones and the cheaper aftermarket variety are made out of mild steel. The nice aftermarket ones are Cro Moly or (lemme see if I can spell this right) Chrome Molybendum. Cro Moly is a far superior material. Mild Steel (1018, 1024, 1040, 1045) has a tensile strength of/around 30,000 psi. Chromoly (4130, 4140, 4340) has a tensile strength of/around 60,000 psi. Twice the strength. It isn't however lighter. Builders and fabricators like myself use around 1/2 as much to get the same strength, and there is where your weight savings comes from. Quote
boonman Posted January 12, 2004 Report Posted January 12, 2004 Chromium Molybdenum. 4130 is the industry standard. It is about the best bang for the buck when it comes to chromoly. 4140 and others have a higher carbon content which adds to the machinability of the metal and it is more hardenable. Quote
Meat Posted January 13, 2004 Report Posted January 13, 2004 What does it take to weld 4130 Chromoly ??? Quote
boonman Posted January 13, 2004 Report Posted January 13, 2004 What kind of welding? I guess it really doesn't even matter. I use the same filler rod when TIG welding, and the same wire when MIG welding that I would use for mild steel. Quote
mrmatt Posted January 13, 2004 Report Posted January 13, 2004 The filler material should be atleast as strong as the base material. You don't want to weld 60,000 psi tensile strengh chromoly with 30,000 psi mild steel wire. Otherwise your weld will become the weakest part of the fabrication. The geometry of many steel fabrications already causes the welds to be the highest stress areas, so they need to be atleast as strong as the base material. Personally I won't touch Chromoly. A couple of people have asked me to shorten their aftermarket swingarms, but I refused to do it since I do not have a tig welder. I personally feel that if the design of a component is critical enough to justify using chromoly, then it should be tig welded. Quote
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