Advantages and disadvantages of plate welding

The advantage of welding is that the heat input is the smallest, the metallographic range of the heat affected zone is small, and the heat conduction deformation is the smallest. Since it is not a contact welding process, wear and deformation of the machine can be minimized. It can be placed at an appropriate distance from the workpiece, and can be redirected between Tools or obstacles around the workpiece. The workpiece can be placed in a closed space (control vacuum or internal gas environment). The laser beam can be focused on a small area to weld small, closely spaced parts. When welding thin materials or thin-diameter welding wires, it is not easy to remelt like arc welding. Not affected by the magnetic field (easy to arc welding and electron beam welding), can accurately align the weldment. Two metals can be welded to have different physical properties (such as different resistance). When welding holes, the width of the weld can reach 10: 1.

Welding development trend For electron beam welding, plasma welding and laser welding, butt joints can be used without openings, which is an ideal narrow gap welding method, which is also one of the reasons why it is widely valued. The newly developed laser arc hybrid welding method can improve the welding speed, such as 5mm steel plate or aluminum plate, the welding speed can reach 2 ~ 3m / min, the forming quality is good, and the welding deformation is small. The main processes of the preparation workshop include material transportation, material degreasing, sand blasting, protective paint; steel scribing, cutting, opening; assembly and positioning of components.

Spot welding the welding system mechanical system consists of three parts mechanical means, power supply means and control means. It also has good electrical and thermal conductivity, requiring welding tongs to use water cooling.

The 50 ~ 60mm steel plate can be welded and formed at one time, the welding speed can reach more than 0.4m / min, and the deposition speed is more than 100 times that of electrode arc welding. The second method is to reduce the cross-section of the trench and the metal cladding.

For example, manual arc welding mainly includes: electrode type (or brand), diameter, current, voltage, welding power source type, polar connection, number of welding layers, number of welding passes, inspection method, etc.

Almost all the heat sources available in the world are used in the welding process, including flame, arc, resistance, ultrasonic, friction, plasma, electron beam, laser beam, microwave, etc. (Our company mainly uses arc welding and resistance welding for automatic welding equipment ).

Precautions for welding arc length The length of the arc is related to the type of electrode coating and the thickness of the coating. Short arc can prevent harmful gases such as O2 and N2 in the atmosphere from invading the weld metal. The welding speed is appropriate. The welding speed has a corresponding change under the conditions of electrode diameter, coating type, welding current, heat capacity of the object to be welded, structure, standard, etc , Cannot be specified.