Re: Wot, not another '79 Targa resto thread
Posted: Fri Dec 29, 2017 10:34 pm
So a quick hour in the garage today, a bit more smoothing of the OSR inner wing patch above the oil filler, an a splash of primer to keep it happy until I get it stripped and dipped.

After lunch I set to on the NSR inner wing patch, where the top mounting for the electrical panel sits. Although I had previously made a tightly fitting patch panel, on closer inspection the metal below the patch was a bit thin in places, so I started again.
The patch generally fitted quite well, but did allow me to play with tight butting (oh-err missus), small gaps and jut over 1mm gaps. Overall I think that I had the best results with the gap about the width of the welding wire. Too small a gap and there was a tendency for the weld to sit on the metal, needing higher power, or risk being too thin when I ground the weld back. Too large a gap resulted in a few blow holes, whereas the narrow gap (0.6mm-ish) allowed small beads of weld with good penetration and no blow through.

After a final grind, fixing of a selection of pin holes, etc, it was also given a splash of primer.

Just a small patch, but with the post weld ‘fixing’ it took about 3 hours ! Slowly, slowly is definitely the right way, and getting the narrow gaps saves a lot of post weld 'fixing'. Having done my experimentation, I just need to improve my patch making to ensure more consistent (narrow) gaps now

After lunch I set to on the NSR inner wing patch, where the top mounting for the electrical panel sits. Although I had previously made a tightly fitting patch panel, on closer inspection the metal below the patch was a bit thin in places, so I started again.
The patch generally fitted quite well, but did allow me to play with tight butting (oh-err missus), small gaps and jut over 1mm gaps. Overall I think that I had the best results with the gap about the width of the welding wire. Too small a gap and there was a tendency for the weld to sit on the metal, needing higher power, or risk being too thin when I ground the weld back. Too large a gap resulted in a few blow holes, whereas the narrow gap (0.6mm-ish) allowed small beads of weld with good penetration and no blow through.

After a final grind, fixing of a selection of pin holes, etc, it was also given a splash of primer.

Just a small patch, but with the post weld ‘fixing’ it took about 3 hours ! Slowly, slowly is definitely the right way, and getting the narrow gaps saves a lot of post weld 'fixing'. Having done my experimentation, I just need to improve my patch making to ensure more consistent (narrow) gaps now

















































