Re: Welding crack in lower unit
True but you dont have to heat the piece with the MIG spool or push pull gun to the extent with a MIG that you do with a TIG as the faster feed of the wire localizes the parent metal melting . I worked as a weld shop supervisor in a sheet metal fab shop for years and for thin sheetmetal where we didnt want any distortion we would only use Cobramatic push pull guns. TIG would warp the hell out of everything as the feed rate isnt fast enough and too much of the heat gets transferred to the parent metal. You can still get excellent penetration on the parent metal with a good fast feed spool gun without warping the panel or casting in the case of the Mercury lower. A few weeks ago I did a full perimeter DEEP weld using a 220 amp DC welder and Miller spool gun on a Mercury lower adding a Bobs LWPU, a fully welded in torque tab, and filled in the water pickups without removing any of the seals or shafts. Pressure tested tight as a drum afterwards with no signs of distortion.
True but you dont have to heat the piece with the MIG spool or push pull gun to the extent with a MIG that you do with a TIG as the faster feed of the wire localizes the parent metal melting . I worked as a weld shop supervisor in a sheet metal fab shop for years and for thin sheetmetal where we didnt want any distortion we would only use Cobramatic push pull guns. TIG would warp the hell out of everything as the feed rate isnt fast enough and too much of the heat gets transferred to the parent metal. You can still get excellent penetration on the parent metal with a good fast feed spool gun without warping the panel or casting in the case of the Mercury lower. A few weeks ago I did a full perimeter DEEP weld using a 220 amp DC welder and Miller spool gun on a Mercury lower adding a Bobs LWPU, a fully welded in torque tab, and filled in the water pickups without removing any of the seals or shafts. Pressure tested tight as a drum afterwards with no signs of distortion.
