Bandsaw blade welding

[Dr Stan]

(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.