You have truly inspired me and I thank you so much for all the years of knowledge you have shared with the me and this community.
I am a novice and learned so much from you and the others on this thread.
I am presently reading the whole thread for the second time in more detail while practicing the techniques you have shared.
I have some, but little welding and restoration experience, although much has been "hack" after reading your posts.
If you could be so kind to answer some questions. I have for an upcoming patch panel repair --both truck wheel arches ---where i won't be able to reach the welds after welding---that is of upmost concern ----
I believe in your posts you said that you would apply epoxy primer, only of course after rust is removed from the back side ---never to be reached after panel is on ---
I have included a picture of the back side of a practice patch weld.
1. Note the arrows how the weld did not bead. Would this cause early failure(from the front it looked perfect)?
The visible "seam" on the back side shows a bit too much for my liking, if you only had a few sporadic spots, it may be a different story.
This shows insufficient weld penetration, where a slight bit more heat would eliminate that issue. Additionally, you have some weld spots that do show weld penetration through the back side, these weld dots appear to be larger in diameter where you sat on the trigger a bit longer. I would suggest to work on your consistency a bit more. A little more heat would give you the weld penetration needed, and a bit less time on the trigger would better limit the size of the weld dot for less clean up. You need to find that happy medium and work to stay in that "zone". You're not that far from being there, btw.
2. I am confused---i keep reading to apply short strand fiberglass filler over the front side welds...regardless of how it looks ----however now that i have been welding via your methods the front side looks perfect, and on occasion i may see a small seam area. If you have a small seam area do you reweld it or how would you address it?
This is very similar to a question I've been asked before. Basically I see fiberglass filler as a Band-Aid to fix weld deficiencies. If the welds are experiencing pin holes, gaps, insufficient welds, or other defects, work to fix the weld issues in the welding stage. For example, here is a picture I pulled off the web that shows insufficient weld penetration.
This would likely be another case where your "resource" that you read from would indicate to use fiberglass filler. The weld penetration is poor at best and the mindset is to use fiberglass filler to add strength that is sorely lacking otherwise. To grind down any weld proud, as we should, it would remove much of the weld strength as it is sitting on top of the panel. I would say that this is an unacceptable repair that will be short lived, and should be redone. This is why I have always stressed to set your welder first and foremost for a full penetration weld, then increase the feed speed to eliminate any blowout (if needed), and fine tune from there. Practice on pieces of scrap the same thickness as your body panels to insure your welder is properly set up before starting on the good panels. I would also say that you should look for alternate resources that don't propose using fiberglass filler over welds. The welds should stand on their own, or work to fix the WELD problems.
3. At times on trimming panels i am reluctant to make a gap between the panels because i am more likely to blow through. Do you ever weld two panels together if they touch at the ****--or do you always create a space ?
Given adequate weld penetration, there is no reason you shouldn't **** the seams tightly together. Any time you leave a gap you also increase the likelihood that any shrinking will pull the panels closer together, resulting in the need for more planishing, or more filler, depending on your finishing methods. Consistency in your methods will go far in weld improvement
Any other feedback that you may have is deeply appreciated.
Humbly appreciated,
Bill