SMAW welding electrodes are used by coating and welding core composed of two parts. When welding, a welding electrode is the one hand, and from the pilot arc current conduction effect, so that between the electrodes and the base metal in a continuous, stable arc, to provide the heat necessary to melt the solder. On the other hand, as a welding filler metal is added to the weld to become a major component of the weld metal. Accordingly, the composition of the welding quality and welding, the chemical composition of the weld metal directly affect the mechanical properties and physical properties. Further, the electrode also has a great influence on the stability of the appearance quality of the weld, the welding process such as welding productivity.

Metalcore welding electrode

Metalcore welding electrodes are outside the paint (coating) uniform pressure is applied to the careful solder core. Different types of welding, welding core are different. Welding electrode core metalcore, in order to ensure the quality and performance of the weld, but the core content of the metal element has strict rules, especially for the content of harmful impurities (such as sulfur, phosphorus, etc.), there should be strict restrictions than the base material. The electrode medicine bag was called a weld metal core coated core. Welding core wire generally has a certain length and diameter. When soldering, the welding core has two effects: First, conducting the welding current, the arc energy is converted into heat, the second core wire itself is used as the filler metal with a liquid molten parent metal fusion weld is formed.

Core solder coating

Pressure applied to the surface of the coating is called core solder coating. Electrode coating plays an extremely important role in the welding process. The use of drug-free light skin-electrode welding, the welding process, the oxygen and nitrogen in the air will be a substantial intrusion of molten metal, the metal iron and beneficial elements carbon, silicon, manganese oxide and nitride formation of various oxides and nitrides, and remains in the weld, weld slag, or cause cracks. The melt into a puddle of gas may cause a large amount of weld porosity, these factors can make the mechanical properties of the weld (strength, impact value, etc.) greatly reduced, while the weld is brittle.

Recommended reading

Oil Pipeline Welding Technology

How To MIG Weld Steel Tubing

How To Improve Rectangular Pipe Welding Technology