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Tool Talk Discussion Forum

Help with metal bandsaw blades

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lawnman

02-07-2005 17:51:37




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Has anyone tried the bandsaw blade welder from Harbor Freight ? Can you fix your own blades at home without a bandsaw blade welder? If you can tell me how so I can give it a try. Thanks for the help. Michael




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T_Bone

02-08-2005 00:53:34




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 Re: Help with metal bandsaw blades in reply to lawnman, 02-07-2005 17:51:37  
Hi Michael,

The blades are first trimed square then put into the welding vise then welded, then the weld ground smooth on both sides.

The weld vise clamps both sides of the blade then gently squeezes the blades together as the resistance heats the joint and as the blades come to red hot temperature then the vise pressure pushs the joint together completeing the weld and is called resistance welding.

Common Pipe seams are also welded this way.

With some trial and error I would think one could make there own welding vise with using a welding machine used for the power supply as long as you watch exceeding the duty cycle rating of the machine.

No heat treatment of the saw blade is required.

T_Bone

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Gerald J.

02-09-2005 11:20:41




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 Re: Help with metal bandsaw blades in reply to T_Bone, 02-08-2005 00:53:34  
In various issues of the British Model Engineer Magazines (concerned with small machine shop practice) its been suggested that you can braze band saw blades.

The blades are scarfed to get a larger contact area, then held in line, fluxed, heated with a torch and brazed. It generally takes a jig to hold the blade ends together. Then the excess brazing metal is ground off and the blade is already annealed.

I've not tried it. I get long life from blade custom made by vendors.

Gerald J.

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Fred Martin

02-08-2005 09:56:53




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 Re: Help with metal bandsaw blades in reply to T_Bone, 02-08-2005 00:53:34  
Most of that is right on the money except the heat treating part.....you must anneal the resistance weld as it is brittle in the as welded condition. Just jogging the anneal button till the blade comes up to a dull cherry red will do it.....should do it..... again after grinding the flash off. Fred OH



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TimV

02-08-2005 11:02:58




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 Re: Help with metal bandsaw blades in reply to Fred Martin, 02-08-2005 09:56:53  
Gotta go with you on this one Fred--we weld blades dozens of times a day in our machine shop at work, and post-weld annealing is essential. If you don't, the blade will nearly always crack the moment you put it back in service. I haven't tried the HF blade welder--our Do-All bandsaw has its own built in welder.



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T_Bone

02-08-2005 11:26:32




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 Re: Help with metal bandsaw blades in reply to TimV, 02-08-2005 11:02:58  
Hi Fred and Tim,

Yep I messed up on that one as it's been too long since I welded a blade.

As they say, first you can't see your toes then....Hummmm.....well you just gotta be there as it goes down hill from there...lol

T_Bone



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TimV

02-08-2005 12:04:20




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 Re: Help with metal bandsaw blades in reply to T_Bone, 02-08-2005 11:26:32  
T_Bone: No problemo--I've seen enough of your posts to know you're more often right than wrong--we're just keeping you honest! :-)



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Davis In SC

02-07-2005 18:01:34




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 Re: Help with metal bandsaw blades in reply to lawnman, 02-07-2005 17:51:37  
Not familiar with that one, but I have welded lots of blades on the welders built in to some vertical bandsaws. It is hard to get a weld like the factories get... One trick I did figure out years ago, is to let Argon flow on the blade at the point of the weld as you make the weld, & also keep using it when you anneal it... yes, it excludes the oxygen , so the weld is much better.. It is amazing at the difference in the quality of weld you get using the Argon.

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lawnman

02-08-2005 21:03:57




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 Re: Help with metal bandsaw blades in reply to Davis In SC, 02-07-2005 18:01:34  
Thanks to everyone for the information!! I have one more question has any one tried to fix metal bandsaw blades at home without using a blade welder ? Best Wishes. Michael



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Davis In SC

02-09-2005 09:36:46




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 Re: Help with metal bandsaw blades in reply to lawnman, 02-08-2005 21:03:57  
Years ago, when it was harder to get things shipped quickly, I have welded larger saw blades with a TIG Welder. Just clamp them so butt ends meet & weld. Then anneal with a propane torch. Not the greatest way to do it, but on Sat night, there are not many options.



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TimV

02-09-2005 08:43:13




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 Re: Help with metal bandsaw blades in reply to lawnman, 02-08-2005 21:03:57  
Lawnman: I've seen it tried, but seldom with success. Any standard weld method (stick, mig, etc.) tends to either make a bumpy weld or a brittle one. It probably could be done by someone with infinite patience, but I've never seen it done routinely. Anyone who does much of this sort of thing has a blade welder. Most people who don't have a blade welder take their blades to a machine shop with a blade welder on their bandsaw. Usually they only charge a couple of bucks or even less if they can fit it in quickly.

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