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There are welds present so it seems reasonable it can be welded again.
I should think any experienced welder could put a clamp on it and push it back in to its original location and configuration. Then tack it to stay there while he adds some reinforcement welded in areas where the stress levels are less. Like on the corners.
Bare in mind welding requires alot of heat and heat can cause distortion in machinery. Not knowing any thing about your machine I would also suggest you consider a mechanicle fix much the same only with nuts and bolts in place of welding.