Well no welding do to the fact I had to figure out the aileron pulley height so I would not rub the rear wing spar. So I am going to wait until I have the wing assembled before adding the pulley bracket. I did over last week talk to a professional welder with 20 years in the Nuclear welding field an...

I have more parts to weld up this weekend. Will post some pictures of the welds. I will clean, shine the parts up and wipe down with lacquer thinner. I used Dykes layout dye to mark the steel parts for layout marks, possibly did not get it all off ... ? Would that cause the black specks? Thanks for ...

... nicely said Steve.

Keri-Ann

Hi Wes, You suggestion is very valet. But in all the aircraft welding I have read and seen no one ever back purges the tubes. So there is something else that they are doing not to get these silicon specks. In Jody's video of him welding a bike frame of 4130 (modified steel) he did not back purge the...

Hey Steve, .... I also know my limits ;) So should I be penetrating the metal to the back side or am I just applying to much heat? Remember most of the welding I am doing is on .035" to .062" wall thickness. If I get a good puddle that is 2/3 into the metal thickness that should be more th...

Hi Wes, Thanks for tips and possible cause. I possibly did pull some from the .05" wall lower support when welding to the .063" wall square tube. I had cleaned both parts to shiny except the square tube inside. I may have been way to aggressive on the penetration, heat, into the square tub...

Thanks Steve for the info, very informative. I have tested a part to destruction and the parent metal tore before the weld let go, good sign. Also cut through the weld and it was solid, looks like it all came to the top. Hard to clean the inside when its half way down a tube, specially on a longeron...

Thanks Len for the reply. I am working on that "stack of dimes" look, much more interested in the integrity of the welds at this point. Glad to hear it is only that. The aesthetics will come with hours of practice, probably the very last weld out of thousands ... LOL! So, what you are sayi...

Hi All, Looks like I need some help here. I am welding some parts, 4130 steel, for my J3 Cub home-built aircraft. After beading the welds I noticed small black specks that are like glass hard and will not bead off without scraping them. Any suggestions what is causing this or what I am doing to caus...