Stop a flat-pack welding table top bowing as you build it: dry-fit, clamp to a flat surface, tack from the centre out, stitch weld in a balanced order and let it cool.

How to choose between 300 × 300, 600 × 600, 1000 × 600 and 1000 × 1000 mm welding table tops, with simple sizing rules for clamps, floor space and frames.