Welding Conditions

With increasing width and length bath increases the radii of curvature of the liquid metal in two mutually perpendicular directions. At the time of reaching one of the radii of magnitude greater than the critical hydrostatic pressure of molten metal and the pressure of the arc exceeds the surface tension force holding the weld pool. There will be a rupture of the surface layer at the root of the weld and the molten metal spilled out of the bath. Formed burnout. The most common measures to prevent burn-through and ensure the formation of proplava desired shape – the right choice of welding conditions and the use of pads. The main parameters include arc welding power 1SV welding current, arc voltage Ua, welding speed vcb. Welding conditions also depend on a number of additional factors: the diameter of the electrode type and polarity of the current position of the electrode with respect to the bath, etc.

Welding current determines the heat output of the arc. With a constant diameter of the electrode with increasing current strength increases the concentration of thermal energy in the spot heating increases the pressure of the arc, the temperature of the gas environment of the arc column stabilize the position of the active spots on the electrodes. With increasing current strength increases the length of the weld pool, and its width and depth of penetration. With the increase of arc voltage also increases thermal capacity and consequently, increasing the size and baths, especially the width and length. At a constant amperage increase the arc voltage has little effect on the depth of penetration. Changing the welding speed at constant thermal capacity of the arc has a significant impact on the size of the weld pool and weld. With the increase of arc voltage also increases thermal capacity and, hence, increasing the size and baths, especially the width and length. When constant current increase of the arc voltage has little effect on the depth of penetration.

Changing the welding speed at constant thermal power of the arc has a significant impact on the size of the weld pool and weld. C increasing speed reduces the depth of penetration and width of the bath, and the length increases slightly. Characterizes the heat input per unit energy in the weld and represents the amount of heat energy input per unit length of single-pass weld. This parameter is very important to evaluate the thermal effects of welding on the main and deposited weld metal. The additional parameters determining the condition and welding characteristics of arcing, include the diameter of the electrode, current type, etc. At a fixed value of heat input can change the diameter of the electrode, current type and polarity, the slope of the electrode to the workpiece surface, welding of the electrode with the vibrations that allows you to receive the specified parameters and weld penetration of the base metal.