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Well I finally broke my harbor freight bandsaw blade after about 3 months of using it. I don't know how successful it is to try and mig weld bandsaw blades but I didn't have anything to lose. I just cleaned up the break with a small sanding disc and clamped the ends together on a piece of angle iron and set my welder on the lowest setting and slowed the wire speed down to 1. After I was finished welding I used the same small sanding disc in my die grinder to sand the weld flush. I have used the fixed blade about 1 hour so far and it works like new. Attached ImagesLast edited by 737mechanic; 07-01-2008 at 04:17 PM.
Reply:Git-r-done!I'd say to smooth out your sanding a bit more. Those small scratches are micro-cracks just waiting to get bigger. A mirror-polish isn't really needed, but I'd say go for at least a 'satin' finish and not rougher than a 'brushed' finish.
Reply:Thats a good point Moonrise, I actually don't expect it to last very long but it might last longer if I smooth it out a bit more. That was 80 grit on a 2 in. sanding disc that I already had on my 90 degree die grinder. I will hit it with some 240 and see if it smooths out nice with that.
Reply:I've done that several times when I just could not get the blade in time to finish a job. Clean breaks are easy, it's when the blade bends and snaps thats a PITA. You may be surprised how long it lasts like that. As long as the teeth are still good It may last quite a while.
Reply:When I was in shop class we always annealed the area welded after grinding the weld off, because the weld is so hard. -Dan
Reply:Originally Posted by engnerdanWhen I was in shop class we always annealed the area welded after grinding the weld off, because the weld is so hard. -Dan
Reply:Originally Posted by matWhy? That only changes the Grain structure of the HAZ, It won't change the hardness of the weld, that is a consumible issue.
Reply:What do you do when all the teeth come off ? :DavidReal world weldin. When I grow up I want to be a tig weldor.
Reply:Originally Posted by wannabe_welderThe smaller the hardened area, the less likely it will cause problems.
Reply:looks goodM Fed
Reply:Keep us posted on progress and how it works out. Your join looks pretty good.You'll either end up with a bandsaw blade with a few joins, or a series of joins with a few teeth!"One of the things we have to be thankful for is that we don't get as much government as we pay for." (Charles Kettering)Mitch 180 (NZ)Lincoln SAM-400-220 + ?-400 Fordson Major + 2 x Tractapac Humber 80 + Procut 40 PlasmaMiller Spectrum 375 |
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发表于 2021-9-1 00:17:56