warped table frame

[Daniel]

your absolutely right lol i cut the side welds and got the top flat and now my holes dont match.

i may do something along the lines of Desertrider's advice and cut the whole middle section out then get my plates to on the 2 outside peices of tube then put the middle tube back in but weld some 1x1 3/16 angle to support it like so.

This is the best idea so far, you could had 2 more pieces of HSS or angle iron on the open end to stiffen the ends up. When welding small materials less weld is better then to much. And never weld square tubing across the face, it becomes a weak point afterward, when you joint two pieces of HSS you should weld only the joint along the corners Less warpage and weak point that way
Good luck

[Sonora Iron]

you should weld only the joint along the corners Less warpage and weak point that way

Until you run into one of these!

[Daniel]

Until you run into one of these!

What I mean is welding 1 HSS to another HSS at 90 degree, you should'nt weld across the face of the one your connecting, only on 2 sides along the corner.
You know what I mean ?

[Sonora Iron]

What I mean is welding 1 HSS to another HSS at 90 degree, you should'nt weld across the face of the one your connecting, only on 2 sides along the corner.
You know what I mean ?

No not sure I do! You mean like this? Weld at the green arrow, not the red?

[Desertrider33]

What does High Speed Steel have to do with making a welding table out of mild steel square tube ??

If you only weld on 2 sides of the tube, the joint is half as strong as the tube...

[Daniel]

No not sure I do! You mean like this? Weld at the green arrow, not the red?

Yes, that's the one

[Daniel]

What does High Speed Steel have to do with making a welding table out of mild steel square tube ??

If you only weld on 2 sides of the tube, the joint is half as strong as the tube...

HSS means Hollow Structural Square.

On a small table like that there's no need to weld it all around.
Like I said the less weld the better,time wise and for saving materials.
And plus you save yourself warping headaches

[Sonora Iron]

Yes, that's the one

I agree with you that on a small table like this welding all the way around is not necessary, but like in my earlier post sometimes the drawings will call for it. Then what do you do?

In my opinion you put any kind of heat inside the red circle, tube A will bend up. To what degree depends on how much heat you apply.

[Daniel]

One method would be pre-stress.

[Sonora Iron]

One method would be pre-stress.

Pre-stress or pre-heat?

If you mean pre-heat I like that! That is thinking about 4 steps ahead of yourself, most weldors can’t think 1 step ahead of them selves unless it’s what they’re going to have for lunch!