The melting rate of welding wire is usually expressed as the melting length or melting quality of welding wire per unit time.

The melting coefficient refers to the quality of welding wire melted per ampere welding current per unit time.

(1) INFLUENCE OF WELDING CURRENT

When the current increases, the resistance heat and arc heat of the melting wire increase, and the melting speed increases.

(2) The influence of ARC VOLTAGE

When the voltage is high, the ARC voltage has little effect on the melting velocity. The Melting Coefficient increases when arc length is short, because the heat loss from arc to surrounding space is reduced when arc length is short, the heat efficiency of arc is improved, and the melting coefficient of welding wire is increased.

(3) Influence of wire diameter

When the current is constant, the smaller the wire diameter is, the higher the resistance heat is, and the higher the current density is, which increases the melting speed of the wire.

(4) Influence of the extend length of welding wire

When other conditions are constant, the longer the length of the wire, the higher the resistance heat, the higher the total heat of the melting wire and the faster the melting speed of the welding wire.

(5) Influence of welding wire material

Different welding materials, different resistivity, resulting in different resistance heat, melting rate is also different.

(6) Influence of gas medium and polarity of Welding Wire

When the welding wire is Cathode (positive connection) , the melting speed is always higher than that when the welding wire is anode (reverse connection) , and varies with the proportion of mixed gas. When the welding wire is an anode, the melting speed of the welding wire is basically unchanged. The gas medium not only affects the heat production of Cathode, the heating and melting of welding wire, but also affects the mode of droplet transfer.