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Results of the calculation evaluation of shape and sizes of weld pool in submerged arc surfacing using combined strip electrode are presented. The mathematical model was used based on solution of nonlinear differential equation of heat conductivity considering the dependence on temperature of thermophysical properties of base metal. The calculated dependencies describing the process of heat spreading in the base metal during surfacing using combined strip electrode were obtained from the conditions of additive action of three sources – one middle strip and two side strips. With increase in heat input at the edges not only shape and sizes of the pool are changed, but also the non-uniformity of penetration increases. It is shown that due to the change in rotation angle of the side strips relative to the middle strip of combined electrode it is possible to influence the shape formation of weld pool and penetration depth. Adequacy of the developed model is confirmed by a well coincidence of the calculated data with the experiment. 10 Ref., 9 Figures.

Evaluation of shape and sizes of weld pool in surfacing using combined strip electrode