Atv swing Arm project

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I have a little 200cc cheap china atv and the swing arm on it broke, which was tissue paper thin so no wonder it broke. Anyway i decided to try to make a new one out of some thick pipe i had laying around. Notched and fitted up weldingTacked upFinished Welds (double passed)Guess what, after all that the engine died (and i mean dead!!) so theres no fixin this up anymoreSo it was a good learing project. Shane
Reply:Cool swing arm pics! I guess you made your choice on a welder? John
Reply:O yea never buy that china junk. After watching what a mig-100 from Hf does. No way i will ever buy china. Lincoln all the way! Can't complain about miller,hobart though!
Reply:looks like you have porosityDewayneDixieland WeldingMM350PLincoln 100Some torchesOther misc. tools
Reply:Did you get it put back together?I would like to see that. In all honesty I know lots of guys who do the same thing on top notch atvs just to get long travel. I wouldn't attempt the job without a jig though.Keep welding and keep posting pics. I use this forum as an escape when I can't handle the kids bouncing off the walls anymore.Lincoln Power Mig 210MP MIGLincoln Power Mig 350MP - MIG and Push-PullLincoln TIG 300-300Lincoln Hobby-Weld 110v  Thanks JLAMESCK TIG TORCH, gas diffuser, pyrex cupThermal Dynamics Cutmaster 101My brain
Reply:Originally Posted by littlefuzzlooks like you have porosity
Reply:Homemade jig to hold the pipe straight in the drill press, using a hole saw bit to notch the tubing. I agree with the crater it showed up once i put a second pass down. This one was done only on a 110 unit maxed out at about 90 amps.
Reply:I wouldn't be too concerned about a little porosity, doesn't look that bad, in fact looks as though the molten puddle has had time to seal off the ejecting gas. If you grind those welds, they will look worse as there is most probably some embedded pores in the welds. You have ample weld on those joints for strength, a little porosity is not going to weaken the structure significantly.