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Stabilisation of the formation of a welded joint in manual argon‐arc welding with activating fluxes

To increase the productivity of the process of argon-arc welding, it is recommended to use activating fluxes. However, this often results in the formation of defects as a result of a decrease in the stability of the main parameters of formation of the welded joint (the depth of penetration H and weld width B). To investigate the reasons for the low stability of weld formation, experiments were carried out with manual argon-arc welding sheets 250x250x10 mm in size produced from St3sp steel through a layer of FAST-1 flux, with a thickness of 0.1 mm, and without the flux. The welding current was 150 A, the mean welding speed 2 mm/sec, with the electrode in the vertical position. Longitudinal macrosections were produced from 12 welded joints in the sheets and used for the measurement of the depth of penetration H with a step of 5 mm. The experimental results show that in welding without the flux the mean arithmetic value H = 2-2.3 mm, and the rms deviation is H = ±0.43-0.55 mm. In welding through the FAST-1 flux H= 3.5-4 mm, Hp = 0.77-1.1 mm (Fig. 1). Thus, in manual argon-arc welding with the activating flux, the deviation of the penetration depth may increase thus increasing the mobility of formation of lack of fusion defects.