On 4/03/2019 2:16 pm, Terry Coombs wrote:
Â* I've read about it somewhere , but don't recall the details ... Broke
the last (nearly new) band for my horizontal , figured I have nothing to
lose but a little time , a bit of shield gas and some 'lectrons - oh ,
and I'll need to make a clamp block to keep the blade aligned as I weld
on it . Got a new blade on the way , but just got a bug to try this . I
know low amps DCEN , what filler ? Got ER70S2 ,ER70S6 (MIG wire) , ER
308/309/312 and some Invar 42 nickel/iron . The blade is an Irwin (IIRC)
bimetal 10/14 pitch . Am I going to need to anneal the weld ? O/A torch
OK for the task if it's needed ? I know I want to minimize the HAZ .


I had a Roll-In saw that seemed to be hard on blades, breaking well
before they dulled. Machined up a fixture to hold the blade in
alignment, and tig welded with 308SS rod, no anneal. Never had a blade
break at the weld.
Had one blade with 5 or 6 welds before it dulled enough to discard. Gave
the fixture to my friend whose welder I'd been using.
Took a picture last time I was visiting, if I can dig it up, will email.

Jon

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