MULTI-LAYER WELDING METHOD OF BUTT WELDED JOINT HAVING GROOVE

摘要

PURPOSE:To perform multi-layer welding while controlling automatically and easily the position of a torch and welding conditions by calculating the rate of deposition per unit time, welding speed, arc voltage, etc. from the sectional shape of the groove to be welded and set welding current value. CONSTITUTION:Welding current is set as welding conditions with a multi-layer welding method for a butt joint of a single Vee groove 1 having a groove angle theta, groove depth (t) and groove root width W0. The welding speed for welding the i-th layer 2 and other welding conditions such as arc voltage, etc. can be calculated from the empirical equation using said conditions. The rate of deposition per unit time is further calculated from various constants and welding current value and the sectional area of the i-th layer is calculated from said rate and the welding speed. The laminating width Wi and thickness hi of the i-th layer 2 are calculated from the laminated width Wi-1 of the (i-1)th layer. Wi is therefore calculated by the successive calculation from the width W0 and further the position of the welding torch for the (i+1)th layer is automatically determined.