S.H hashemi - University of Birjand, Department of Mechanical Engineering, POBOX ۹۷۱۷۵/۳۷۶
kh khalili - Department of Mechanical Engineering, University of Birjand, Birjand, Iran
m.a moradpour - Department of Mechanical Engineering, University of Birjand, Birjand, Iran
m salimi - Department of Chemical, University of Birjand

Modeling and optimization of welding processes is one of the important topics for welding researches. In such research, it is necessary to measure the weld bead geometry. Nowadays, machine vision (MV) has a widespread use in measurement applications. In order to use MV in weld beadgeometry measurement, it is necessary to acquire the desired images of cross section of welded plates with desirable separation of weld and base metal regions. This separation is performed by suitable solution to etch cross section of welded plates. In this paper, it has been tried to determine suitablesolution to etch cross section of welded plates (made from API X56 steel) for obtaining the best revelation of weld metalregions. This solution can be utilized to obtain desired image ofwelded plate’s cross section for machine vision measurement of weld bead geometry

weld bead geometry, machine vision, API X65 steel,submerged arc welding