Welding rods

A strip of metal that is melted to fill the joint of the weldment during gas or electric welding.

The coated electrode is applied to the metal core by evenly pressing the coating to the core. The welding core is the metal core of the electrode, in order to ensure the quality and performance of the weld, the content of the metal elements in the welding core have strict regulations, especially the content of harmful impurities (such as sulfur, phosphorus, etc.), should be strictly limited, better than the base material.

The electrode is composed of welding core and coating. Electrode is in the metal core outside the coating (coating) evenly, to the heart of the pressure coated on the core. The type of electrode is different, and the core is different. The welding core is the metal core of the electrode, in order to ensure the quality and performance of the weld, the content of the metal elements in the welding core have strict regulations, especially the content of harmful impurities (such as sulfur, phosphorus, etc.), should be strictly limited, better than the base material. The composition of the welding core directly affects the composition and performance of the weld metal, so the harmful elements in the welding core should be as little as possible.

Welding carbon steel and low alloy steel welding core, generally choose low carbon steel as the core, and fill manganese, silicon, chromium, nickel and other components (see the national standard of welding wire GB1300-77). On the one hand, the reason for using low carbon is that the steel wire has good plasticity when the carbon content is low, and the welding wire is easier to draw. On the other hand, it can reduce the reducing gas CO content, reduce spatter or porosity, and increase the temperature of the solidification of the weld metal, which is favorable for the inverted welding. The addition of other alloying elements is mainly to ensure the comprehensive mechanical properties of the weld, and also has a certain effect on the welding process performance and the removal of impurities.

High alloy steel and aluminum, copper, cast iron and other metal materials, in addition to the requirements of the welding core composition similar to the metal, but also to control the content of impurities, and according to the process requirements often add some specific alloy elements.

The electrode is a melting electrode for electrode arc welding with coating, which is composed of coating and welding core. There is about 45° chamfering in the electrode front covering to facilitate arc initiation. There is a bare welding core at the tail, accounting for about 1/16 of the total length of the electrode, which is easy to clamp and conductive. The diameter of the electrode actually refers to the diameter of the welding core) is usually 2, 2.5, 3. 2 or 3, 4, 5 or 6mm and other specifications, commonly used is small 3. 2, small 4, small 5 three, the length “L” is generally between 250^-450 mm.

Name of welding rod

E   Carbon steel electrode, low alloy steel electrode

L   Low alloy steel electrode for low temperature

S   Chrome-nickel austenitic stainless steel electrode

H   Low alloy and stainless steel electrodes for heat resistance

K   chromium stainless steel electrode

C   Cast iron electrode

N   Nickel and nickel alloy electrode

R   Surfacing electrode

Cu  copper and copper alloy electrode