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silver soldering vs soldering of bandsaw blades

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  • silver soldering vs soldering of bandsaw blades

    Can regular electronics solder do the job?

  • #2
    Not enough strength, and poor bonding.
    I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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    • #3
      Silver solder is the only way if you solder. Make your self a fixture to hold the bade together. Grind the ends on a curf

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      • #4
        I had some plans for a home build blade welder some where. I look a little harder maby your interested

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        • #5
          In a word, NO. Not even close.

          Silver soldering is weak enough, no way 60:40 lead solder is likely to work for more than a few seconds if you can even tension the blade.

          It probably WILL "wet out" OK on the steel, so it will "bond"... the problem is the lead won't stand up to the stresses.

          Plumbers no-lead is stronger, but still not good enough. Might last a bit longer. Welding, or silver solder if you must, is the way to go.
          1601

          Keep eye on ball.
          Hashim Khan

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          • #6
            Nope. Even if you succeed in grinding fairly long and tightly overlapping tapers on the blade ends, the amount of overlap area for bonding is quite small. Silver brazing (a.k.a. silver soldering) can provide the required strength if done well, but there is no way ordinary tin-lead solder is going to. There has to be a minimal amount of solder so the blade thickness isn't increased; otherwise the joint will bind in the saw kerf.
            ----------
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            • #7
              Local hardware store rewelds my broken blades for like $5.
              Andy

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              • #8
                The guys are all dead on, electrical solder will never work.
                I've silver soldered my blades in the past and it always worked well for me. I've also TIG welded them too but you have to aneal after welding or the joint will break.

                Your jig should have a gap where the blade halves meet or most of the heat will be sinked out or you may end up sticking it to the jig if you use sliver solder.

                JL.....................

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                • #9
                  No stores around here to weld bandsaw blades, but would like to know how many amps to weld bandsaw blades. How many?

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                  • #10
                    Originally posted by Elninio View Post
                    No stores around here to weld bandsaw blades, but would like to know how many amps to weld bandsaw blades. How many?
                    I never paid much attention to the amp setting, using a foot pedal it was what ever it took to fuse the blade halves. Maybe 10 amps ???
                    Also when welding you don't want a gap in you jig or you'll burn through. It's the one instance when you do want something under the blade to prevent fall out.

                    JL.....................

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                    • #11
                      Originally posted by JoeLee View Post
                      I never paid much attention to the amp setting, using a foot pedal it was what ever it took to fuse the blade halves. Maybe 10 amps ???
                      Also when welding you don't want a gap in you jig or you'll burn through. It's the one instance when you do want something under the blade to prevent fall out.

                      JL.....................
                      I burnt a 20A output transformer today, it's gotta be more than that?

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                      • #12
                        Originally posted by GEP View Post
                        I had some plans for a home build blade welder some where. I look a little harder maby your interested
                        got one in the making, it's almost done, just gotta rebuild my transformer

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                        • #13
                          Originally posted by Elninio View Post
                          I burnt a 20A output transformer today, it's gotta be more than that?
                          What type of welding caused your transformer to burn out???? I doubt it was TIG. I would guess your trying to duplicate some form of resistance or spot welding like a true band saw blade welder would do.

                          JL.........................

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                          • #14
                            Depending on the size of the blade, I'd W.A.G. the current as easily in the hundreds of amps..... Spotwelding runs to thousands of amperes...... but has more possible conduction paths for heat to leave the joint (all directions in the sheet metal, plus into the tongs). The saw blade may not need as much since it has less conduction of heat away.

                            Spotwelding 0.030 aluminum for electronic device cases took about 2500A, as near as I can tell from the ammeter and ratio on the spotwelder we use at work
                            1601

                            Keep eye on ball.
                            Hashim Khan

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                            • #15
                              Spot welders for band saw blades also have timers that cut the power before the joint is blown away. I believe the time is calculated by the width and thickness of the blade and the power requirements.

                              JL.................

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