There is no explicit definition and distinction between medium and heavy duty H Beam in Steel Structure industry. In common practice, 12mm height welding seam is the threshold for distinguishing heavy and medium duty H Beam;
H Beam Fabrication Machine can complete 12mm welding toe on finished H Beam with single time welding pass; For heavier duty workpieces with 12mm plus welding seam, H Beam Gantry Welding Machine should be used.