The welding method of Sealing Wire

Sealing Wire has more than 40 welding methods, which are mainly divided into three categories: fusion welding, pressure welding and brazing.

Fusion welding is a method in which the interface of the workpiece is heated to a molten state during the welding process, and the sealing wire is welded under no pressure. During the welding process, the heat source rapidly heats and melts the interface between the two workpieces to be welded, forming a molten pool. The molten pool moves forward with the heat source and forms a continuous weld after cooling, connecting the two workpieces into one body.
The manufacturer of Sealing Wire tells you that during the welding process, if the atmosphere is in direct contact with the high temperature molten pool, the oxygen in the atmosphere will oxidize metals and various alloying elements. When nitrogen and water vapor in the atmosphere enter the molten pool, the weld will form pores, slag inclusions and cracks in the subsequent cooling process, which will deteriorate the quality and performance of the weld.
The manufacturer of Sealing Wire tells you that in order to improve the quality of welding, people have developed various protection methods. For example, gas shielded arc welding uses argon, carbon dioxide and other gases to isolate the atmosphere to protect the arc and molten pool rate during welding. For example, when welding steel, add ferro-titanium powder with high affinity for oxygen to the electrode coating to deoxidize , Can protect the beneficial elements of manganese and silicon in the electrode from being oxidized and enter the molten pool, and obtain high-quality welds after cooling.
The manufacturer of Sealing Wire tells you that pressure welding is to combine two workpieces in a solid state under pressure, also known as solid state welding. The commonly used pressure welding process is resistance butt welding. When the current passes through the connecting end of the two workpieces, the temperature rises due to the high resistance. When heated to a plastic state, they are joined together under axial pressure.
The manufacturer of Sealing Wire tells you that the common feature of various pressure welding methods is that pressure is applied during the welding process without filling the material. Most pressure welding methods, such as diffusion welding, high frequency welding, cold pressure welding, etc. There is no melting process, so there are no problems such as the combustion of beneficial alloy elements and the intrusion of harmful elements into the weld seam, which simplifies the welding process and improves welding safety and sanitary conditions. At the same time, because the heating temperature is lower than that of fusion welding, the heating time is shorter and the heat affected zone is smaller. Many materials that are difficult to weld by fusion welding can often be welded by pressure welding into high-quality joints with the same strength as the base material.
Brazing is to use a metal material with a melting point lower than the workpiece as the solder, heat the workpiece and the solder to a temperature higher and lower than the melting point of the workpiece, wet the workpiece with liquid solder, fill the interface gap, and realize the mutual diffusion of atoms and the workpiece , So as to realize the welding method of Sealing Wire.
The joint that connects the two connecting bodies formed during the welding process is called a weld. Both sides of the weld will be affected by welding heat, and the structure and performance will change. This area is called the heat-affected zone. The manufacturer of Sealing Wire tells you that due to differences in workpiece materials, welding current, etc., overheating, embrittlement, hardening or softening of the weld and heat-affected zone may occur after welding. This also reduces the performance of the welded parts and deteriorates the weldability. Therefore, it is necessary to adjust the welding conditions. Preheat the interface of the welded parts before welding, heat preservation during welding, and post-weld heat treatment can improve the welding quality of the welded parts.
In addition, welding is a process of local rapid heating and cooling, and the welding area cannot be freely expanded and contracted due to the constraints of the surrounding workpiece body. After cooling, the weldment will produce welding stress and deformation. Important products need to eliminate welding stress and correct welding distortion after welding.　　
The manufacturer of Sealing Wire tells you that modern welding technology has been able to weld welds without internal and external defects, and its mechanical properties are even higher than the mechanical properties of the connecting body. The manufacturer of Sealing Wire tells you that the mutual position of the welded body in space is called a welded joint. The strength of the joint is not only affected by the quality of the welding, but also related to its geometry, size, stress and working conditions. The basic forms of joints include butt joints, lap joints, T-joints (forward transfer) and corner joints.