Learn about laser welding methods and features in one article

 Welding is a process commonly used in industrial production, there are a variety of welding processes, and the following is an introduction to several common laser welding methods. 

1. Laser fusion welding: Laser is a kind of high energy density and high-intensity radiation, which can melt and heat materials in a very small distance, so it can connect any materials efficiently.

2. Laser Arc Welding: The laser beam emitted by the laser, through the wire feeding system forms a molten pool on the welded workpiece (or workpieces), the use of arc melting the welded workpieces or weldments laminated together to complete the welding.

3. Laser brazing: the use of specific lasers and special nozzles or brazing heads, in the form of an electric arc or light radiation and other forms of heating the workpiece and completing the welding.

4. Laser melting welding: the laser sends out a laser beam, heats up the metal to a molten state, and sprays the molten metal to the workpiece through the nozzle to realize welding.

Laser welding Features

1. Welding on the surface of the material without touching the surface of the workpiece can be used for any metal or alloy, especially for certain materials that cannot be welded conventionally. 


During laser welding, the laser beam transmits energy to the material through a reflector and the laser is reflected back to the laser. As the beam passes through the material being welded, it leaves a molten pool on the surface of the material. This way, the laser enables precise welding, even of thicker workpieces than conventional welding consumables.

 

Advantages: allows joining of various materials (including composites)

Disadvantages: requires a higher power laser and a matching specialized fusion welding machine.

 

2. Compared with argon arc welding, laser welding can weld a variety of complex shaped parts.

 

For example, it can be used to weld various metals such as steel, copper, and aluminum, while ensuring high welding quality. Welding smaller shapes on smaller diameters can weld parts with diameters less than 1 millimeter but greater than 200 grams. In addition, the use of high-power lasers makes laser welding operations possible without the need for other auxiliary equipment. Therefore laser welding has a wide range of applications in industrial production.

 

3. Laser welding does not require preheating (generally not required, depending on the requirements of the process, some materials are required.), There is no heat input during the welding process and the molten pool is stable. The advantages of this particular welding method are obtained in many cases where traditional manufacturing processes are not competent or costly. There is no heat input during the welding process, so laser welding eliminates the need for preheating and cooling. It results in weld metal with optimum geometry, heat-affected zone, and anisotropy. The weld has good mechanical and mechanical properties, making it widely used in various industrial fields, especially in automobile manufacturing, machining, and metal processing industries.

 


4. The workpiece can be used with only simple pretreatment.

 

The surface of the workpiece does not need any special treatment, such as polishing and grinding. Simple and convenient to use, the laser welding equipment can directly weld the workpiece.

 

Application scope:


Used for auto body welding, mechanical parts, molds, pipe fittings, and so on. Suitable for all metal materials, such as copper, aluminum, stainless steel, and some special alloy steel welding, can be widely used in the manufacture of automobile bodies, industrial parts, and other fields.

 

5. It can be welded with less or no welding wire, thus reducing cost and time. (In special cases, depending on the process requirements, whether or not welding wire is needed.)


Therefore, in many cases, good welding results can be achieved with very little welding wire or minimal laser power.

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