Frame corners

Hello,
Is it necessary to mitre cut the frame corners?
I have seen some pictures somewhere on the net of a td frame that was made without mitred corners the cross members where welded to the inside of the main rails.
Your opinions are very welcome and thanks
Stephen G
Is it necessary to mitre cut the frame corners?
I have seen some pictures somewhere on the net of a td frame that was made without mitred corners the cross members where welded to the inside of the main rails.
Your opinions are very welcome and thanks

Stephen G