Chainsaw Mill, repair

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I put together a mill, well more of a guide, for milling rough timbers with a chainsaw.  More on the mill on this post at ArboristSite, http://www.arboristsite.com/showthread.php?t=147105I was in a hurry when I built the guide and didnt want to wait fot it to cool so I ran it under a tap, stupid idea I know but I have never had an issue with messing with the metal like that, till now.I turns out that the guide is under alot of stress and vibration and I suppose that rapidly cool the steel (1/8" x 1" flat bar) made it brittle.  It cracked through on the leading edge and was well on its way on the trailing edge.  I repaired it with ER70-S, tig @ about 90amps.  The crappy crater at the ends of the weld comes from the fact that my technique sucks and I dont have a pedal with my tig, I stop the weld by just pulling away, leaving arc traces.  Any advice on getting rid of the crater without a pedal or remote.  I have never used one and have used this little for almost all of my projects.  It's a Maxstar 150. Attached Images
Reply:Set it to scratch/stick start and rock/drag the cup/tungsten back like you mean it. Then at the end roll the travel back add a little filler before breaking the arc.Also my guess is the crack started at the edge of that little arc nugget, there is also an undercut on the right that should be peened/blended or it may start cracking there. I'd also peen the tig crater if it's already not to late.MattLast edited by Matt_Maguire; 09-10-2010 at 09:55 AM.