The best welding method is MIG (Metal Inert Gas) welding for box structures, as it produces a clean, precise, and strong weld. Use clamps and straighten the box components so that all of them form beginner edges. I used 1/8" steel from a local scrap yard. more Cool. Welding a box may look like an easy task, but combining sections of a box to form a strong and lasting joint requires some unique skill and strategy. Whether it's a trained professional welder or someone who enjoys doing things alone, knowing the “how-tos” of welding makes it possible to polish the. Is there a good way, to weld box section, say 50x50x3mm, together, end to end, and have it be straight when your finished? You could internally sleeve it with another smaller box section, we occasionally used that method with large boat trailers, we also drilled the outer section and plug welded. To build a high-quality metal container, start by cutting your steel sheets with precision, deburring the edges, and using magnetic squares to maintain perfect 90-degree angles during tack welding. Once tacked, finish your welds using a consistent travel speed and proper heat settings to ensure a. How about posting some pics so other welders can get some ideas? 29x17x9 inches with the material being 3/8 inches thick. It's going to be welded with 7018 electrode.