| For thick plate of high-strength steel, it is extremely important to control of residual stress. A new method for thick plate which does not require back gouging - two-sided arc welding - is adopted to control stress. Root pass adopts asymmetrical two-sided gas tungsten arc welding with wire feed in vertical up welding. The key of controlling stress for this method is to determine the arc distance and welding parameters of two-sided arcs. The effects of arc distance between fore and rear torches and heat inputs on the stress are investigated through experiments and numerical simulation. The calculated results are in a good agreement with the experimental results. The influence mechanism on welding stress of the arc distance and heat input is obtained. Research results show that selecting proper arc distance and regulating heat input of two arcs control effectively stresses. |
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