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Dick L 03-20-2013 17:15:48 50.51.145.2 Report to Moderator	When Sohio instructed me in repair welding high pressure hydraulic pipe back in the 1960's, after the first hot pass it was necessary to peen with the sharp end of the chipping hammed hard. I was not instructed to peen the final pass. [Reply]   [No Email]
Puddles 03-20-2013 17:25:07 24.113.77.208 Report to Moderator	Re: Peening welds in reply to Dick L, 03-20-2013 17:15:48   It is written in the Lincoln Procedure Handbook of Arc Welding, not to peen the root pass, or cover pass. [Reply]  [No Email]
Dick L 03-21-2013 09:16:00 184.8.58.116 Report to Moderator	Re: Peening welds in reply to Puddles, 03-20-2013 17:25:07   The peening just reminded Of what I did which was different than the subject in the thread. However the high pressure hydraulic repair was not joining two sections of thick wall pipe but removing old weld with blow rod and rewelding cast steel fittings back on without loosing bolt on locations. When welding the hot root pass oil between the pipe and fittings would cause pin holes in the weld. The weld needed to be peened to close tight all pin holes or you could get pin holes that would seep. We did not have seeping with this procedure. [Reply]  [No Email]