Welding process in extra heavy-duty caster technology

Welding is a process that we usually encounter when making industrial super-heavy casters. Welding of super-heavy casters is a process that we often encounter when producing casters. It usually refers to two or more materials. The process of using heat or pressure or both to achieve the bond between atoms to form a permanent connection is called super heavy caster welding. We usually call the metal welded by super heavy casters the base material. There are many nouns used in the welding process of super-heavy casters, and different nouns have different fields in the welding process of super-heavy casters.

1. Super heavy caster welding terms:

a. What is arc:

Powered by a super-heavy caster welding power source, a strong and long-lasting gas discharge phenomenon - called arc - is produced between the two poles.

b. What is protective gas:

The gas used to protect the metal droplets and molten pool from the intrusion of harmful external gases (hydrogen, oxygen, nitrogen) during super-heavy caster welding - protective gas.

c. Super heavy caster welding technology:

The general name of various caster welding methods, caster welding materials, caster welding processes, caster welding equipment, etc. and their basic theories is called caster welding technology.

d. Super heavy caster welding process:

A complete set of process procedures and technical regulations in the welding process of super heavy casters. The content includes: super heavy caster welding method, pre-welding preparation, assembly, caster welding materials, caster welding equipment, caster welding sequence, caster welding operation, caster welding process parameters and post-welding treatment, etc.

2. Welding method of super heavy casters:

a. Brazing is to use a metal material with a lower melting point than the workpiece as the solder. The workpiece and the solder are heated to a temperature higher than the melting point of the solder and lower than the melting point of the workpiece. The liquid solder is used to moisten the workpiece, fill the interface gap and connect it with the workpiece. The workpiece realizes mutual diffusion between atoms, thereby realizing the welding method.

b. Welding technology is mainly used on metal base materials. Commonly used ones include arc welding, argon arc welding, CO2 shielded welding, oxygen-acetylene welding, laser welding, electroslag pressure welding, etc. Non-metallic materials such as plastics can also be used. welding. There are more than 40 metal welding methods, which are mainly divided into three categories: fusion welding, pressure welding and brazing.

c. Fusion welding is a method in which the workpiece interface is heated to a molten state during the welding process and the welding is completed without applying pressure. During welding, 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 after cooling, a continuous weld is formed to connect the two workpieces into one body. Pressure welding is to achieve interatomic bonding between two workpieces in a solid state under pressurized conditions, also known as solid-state welding. The commonly used pressure welding process is resistance butt welding. When current passes through the connecting end of two workpieces, the temperature rises due to the large resistance. When heated to a plastic state, the connection becomes one under the action of axial pressure.

d. The seam connecting two connected bodies formed during welding of super heavy casters is called a weld. The two sides of the weld will be affected by the welding heat during welding, causing changes in structure and properties. This area is called the heat-affected zone. During welding, due to different workpiece materials, welding materials, welding current, etc., overheating, embrittlement, hardening or softening may occur in the weld and heat-affected zone after welding, which will also reduce the performance of the weldment and worsen the weldability. This requires adjusting the welding conditions. Preheating the interface of the weldment before welding, insulation during welding and post-weld heat treatment can improve the welding quality of the weldment.