12-19-2015, 05:49 PM
(12-19-2015, 04:32 PM)Dr Stan Wrote:(12-19-2015, 10:37 AM)RobWilson. Wrote:(12-19-2015, 09:44 AM)Dr Stan Wrote: I'll have to respectfully disagree as grinding the weld flush re-hardens the weld thus requiring a second round of annealing.
Here's a good YouTube on how to resistance weld a bandsaw blade including a 2nd tempering/annealing step.
https://www.youtube.com/watch?v=GBwr3oPJHcs
With respect could you please explain how grinding the blade heats the blade up to a sufficient temperature that it becomes hardened ?
Rob
All one needs to do is watch the color change of the blade and then refer to a steel color/temp chart. You'll quickly discover just how hot the blade becomes during grinding which in turn explains the re-hardening.
But if one watches the video you point to one can clearly see that the blade is clean silver in color where it had been ground , showing that it had been no where near the RED heat required to harden the blade .
Funny thing ALL my Starrett bandsaw blades metal and wood show a silver weld grind ,
So do the ones on the Enco site , using USA site here .
http://www.use-enco.com/ProductImages/0902234-24.jpg
http://www.use-enco.com/ProductImages/0332208-23.jpg
Funny that the Enco blades are the same as mine and show no signs of a second heating
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, maybe someone should inform Starrett that they are making their blades incorrectly ,maybe point them to the youtube video .Rob