TWI Industrial Member Report Summary 79/1978
By J C McGlone
The effect of preparation angle on butt weld geometry has been examined for conventional d c electrode positive single wire submerged-arc welding of mild steel plate. Additional major variables examined were welding current, voltage, travel speed and electrode diameter. A manganese silicate flux, and 19mm mild steel were used throughout. The effect of joint mismatch on root penetration-and the determination of root face dimensions to avoid burnthrough were also studied. The influence of the variables examined on significant weld bead dimensions was established using a factorial approach. An analysis of the results obtained has indicated the significant effects of preparation angle and allowed the development of a technique to predict acceptable welding procedures to join material of up to 25.4mm thickness in two passes.