Weld a Channel to MS Plate

Why not use 200 x 100 box section to start with?

im designing it for a frame structure which will be further welded with several plates. hence it should have sharp edge, and also just one side with thicker wall is enough to weld with, that's y i chose this combination.

Proprietary box section has known structural strength. Any homebrew structure doesn't and it will need to be designed-in instead.

Good luck with the design.

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If the plate is the same width as the channel, you have to use a partial penetration weld, and then grind it if you need a smooth surface. The problem with this is that the toe of the channel is rounded, this could be a problem even if the prep in in the plate. Then there is the question of whether there is sufficient weld for the applied forces.

Frankly, I'm not sure you should be designing structures based on the limited knowledge you have shown here.

Assuming the plate is attached to the toes of the channel, what is its width? that will control the type of weld.

The amount of weld you need is a design problem.

Do a web search for weld configurations and see what fits.

If this will support much weight, I'd hire someone to do the welding.

You can grind a 45° angle where the leg meets the edge of the plate and weld. As long as the root of the weld is not under bending tension. it will work.

In spite of the replies above, you may still be subject to AWS D1.1M and need qualified procedures and welders.

http://www.aws.org/technical/d1/d1.html

P.S. Here we prefer full words to text speak, please use words

The biggest problem you will have is since the welding is all on one side, the beam will bow like a banana with the heat input from the welding. This can be heat straightened but this requires an oxy acetylene torch and a lot of experience. Since you said you are not a welding pro I would suggest you take it to a professional as the skills required to do this job will only be found with an experienced tradesman. Even if you do go ahead and weld this up yourself it is hard to give you a procedure without knowing the welding process you will be using, the standard to which it has to be welded and what it will do exactly. All these things will affect the way the job has to be approached.