The continuous development of the construction industry has allowed more building materials to enter the market. National standard channel steel is one of them, and it is widely used. Therefore, we must learn to be familiar with the advantages of national standard channel steel in all aspects and the production process. Then the welding methods of national standard channel steel and What is the welding form and what methods are there? Let's learn together!
Below we will introduce three welding methods, the first is electrode arc welding; the second is carbon dioxide (COz) gas shielded welding; the third is submerged arc welding.
a. Rod arc welding
Manual arc welding, also known as manual arc welding, hand arc welding or coated electrode arc welding, is a welding method that uses a hand-operated electrode for electric meat welding. The principle of electrode arc welding is to use the arc heat generated by the electrode and the workpiece to melt the metal. During the welding process, the electrode flux melts and decomposes, producing gas and slag. Under the joint protection of gas and slag, the harmful effects of the surrounding air are effectively eliminated. Through the metallurgical reaction between the molten metal and the slag at high temperature, the metal is reduced and purified to obtain an ideal weld.
b. Carbon dioxide (COz) gas shielded welding
Carbon dioxide (Cq) gas shielded welding is a welding technology developed in the 1950s. According to the degree of automation, it is divided into two types: fully automatic CO, Eagle shielded welding and semi-automatic CO, gas shielded welding. During construction, national standard channel steel is mainly used Semi-automatic processing.
(1)CO: Characteristics and welding requirements of gas shielded welding.
(2) Composition of semi-automatic gas shielded welding machine. Semi-automatic CO and gas shielded welding machines generally consist of arc welding power supply, wire feeding mechanism, welding wire, gas and other parts.
C. submerged arc welding
Submerged arc tick is an automatic welding method in which electricity burns in the cavity in the granular flux layer. The radiant heat of the arc melts the weld seam, broken wire and flux, evaporates to form gas, and discharges the arc around the molten pool. A closed cavity in which the arc burns stably. The upper part of the mold cavity is a layer of molten flux, which is the slag film am. This layer of slag film can not only effectively protect the molten pool metal, but also protect the arc radiation from being emitted during operation. At the same time, when melting, a large amount of flux has a strong effect on the molten pool metal. Reduction, purification and alloying.
The main difference between submerged arc welding and manual welding is that it is mainly used to start the arc, maintain a stable burning arc, transport the welding wire, move the arc, and fill the arc crater at the end of the welding and other actions, all by using the submerged arc. realized.
