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The study revealed that the application of flux paste to the back side of the welded joint during welding of low-alloyed steels provides control over the sizes of the root and its defect-free formation. It was found that the back bead height of the root welded with flux paste is 1.5 to 3 times less than that of the root welded with the same welding variables without flux paste.

The work investigates the thermal balance of a low ampere arc. The dependences of the thermal flow in the cathode and anode on the amperage, the diameter of the non-consumable electrode and the length of the arc gap are shown.

The possibility of replacing, blowing argon into flux paste, when welding joints with free formation, where it is technically impossible to use other techniques and methods of welding, providing stable formation with minimum geometric parameters of the back bead, is shown.