Posted by 135 Fan on January 30, 2010 at 11:53:45 from (68.149.56.30):
In Reply to: Re: Welding question posted by trucker40 on January 30, 2010 at 09:56:11:
A professional welder would never leave the slag on a weld. How can you be certain that something you got used was welded with 7018? For welding truck frames, a stronger rod than 7018 is preferred because frames are usually made of higher tensile steel. About the only time a MIG would be a better choice than stick, other than for faster production, would be on thinner material where burn through could be a problem. Anything that could be welded with MIG could also be welded with stick. Again the thickness may be the only limiting factor. Look at a rod selection chart for the different types of steel. Comparing brazing to MIG welding? That really takes the cake!!! However, in some instances brazing is a better choice than arc welding. Repairing steel hydraulic lines is one example. Brazing is not a fusion process like arc welding. The only thing that gets melted when brazing is the brazing rod. Silver solder which is a brazing process can be used in a lot of applications that welding can't be used. Fittings on hyd. tubing are silver soldered from the factory and very rarely fail. Hyd. tubing is very high quality low carbon steel. It could be welded but would need to be stress relieved which is too time consuming. No, 7018 is not the best choice of rod in all applications but as long as the piece needing repair is thick enough to weld with 7018, MIG wouldn't make a stronger repair. It is very clear that static and dynamic loading principles are so far over your head, that it's pointless to try and enlighten you. You really need to take a course or spend some time talking with a welding engineer or technologist. You really don't know what you're talking about. Maybe you could send Lincoln an e-mail and get some much needed knowledge before you make ridiculous statements that MIG is stronger than stick on farm machinery because it puts less heat in the weld. MIG/Flux-core is used because it is faster. It's not rocket science to figure that out. Maybe you'd listen more to an engineer but then again, maybe not. I'm still scratching my head over your comparing brazing to MIG welding on a piece of machinery. Dave
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