My best welding so far... Aluminum... Pic

[CGCINC]

yes. You just gotta go slow at the last open area because of the pressure inside it. First time I did one of these it was like "Kapooof!" Blew out a big hole and made a mess.....I learned on that one!

[sportbike]

yes. You just gotta go slow at the last open area because of the pressure inside it. First time I did one of these it was like "Kapooof!" Blew out a big hole and made a mess.....I learned on that one!

Welds look great! Nice work.

One tip that usually works on a sealed weld is to actually weld 75% of the box, then drill a `1/8" hols in the corner of one of the completed welds to act as a vent. finish up all of the welds, then let the item cool. Go back and fill the hole. The cool box and cool air tends to take a little time to expand and doesn't build as much pressure as quickly. Depending on the size of the part, sometimes this does no work due to the part heating very rapidly and the air expanding very quickly anyway. Could probably also just leave a 1/4" or so at the end of one of the welds, let it cool and come back to save on drilling / filling.