New build - Steel - 3 Axis initially then conversion to 4 axis.

[Tom J]

Looking goid mate! Tack welds are the way to go. And lots of clamping. I would have got a piece of say 35x70mm box tube and clamped it in several places to the flat bar piece you were working on. Then going from the outsides in to the middle as your box frame will also slightly warp from the welds. Tack everything first then repeat the clamping process all over again with your filler welds.

It's hard with long runs like that. Partly the reason bojan S uses C channel for his bed. Although I find welding much easier, drilling and bolting would have given a better result.

Whats the link for your thread?

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My frame was not more than 1mm warp as I tack it everything and weld one bead at the time, cool down and opposite side and so on. I have to admit that I broke my rule and did not let to cool enough (firstly was warp corners down than after cool opposite) - £100+ waste on steel and gas, lesson learnt. I bit it with sledge hammer, driven by the car and finally filled down, so my 8mm bars became 4mm in places:)
Now I use Tig just to see if I can do better