Welding Precautions-Shenyang Jinyan Laser Remanufacture Technique Development Co., Ltd

1. Matters needing attention in the preparation of welding plates What are the problems?

① The best process methods for preparing weldment blanks from plates mainly include flame cutting, shearing, sawing, punching and blanking, blanking, turning of bars and tubes, etc.

② When considering the method of preparing the weldment blank, the dimensional accuracy of the weldment and the groove quality requirements should be fully considered, and the subsequent processing of other materials, the groove shape or the groove opening requirements should be considered.

③ When considering the size of the cut blank and the preparation of the groove during welding, it should be noted that not all welds are continuous welds. V-shaped grooves with continuous welds sometimes cannot meet the requirements of use.

④ For single-sided V-shaped grooves, a single cutting nozzle can be used to cut the grooves; on the contrary, for double-sided V-shaped grooves, multiple cutting nozzles can be used to cut the grooves, and the same cutting equipment can be used for the cutting process. Finish.

⑤ J-shaped or U-shaped grooves are sometimes required for thick plate materials, which can save weld metal compared with double-sided V-shaped grooves.

⑥ Sometimes it is necessary to consider whether the casting or forging structure can eliminate the complex section of the weldment, and whether it can simplify the welding design and reduce the manufacturing cost.

⑦ For the key parts of structural connection, expensive materials (such as a small amount of surfacing alloy) can be used instead of general welding materials, which can achieve good results.

⑧ When the parts need to be crimped, sealed or added with reinforcing plates, the workpieces manufactured by welding methods should be considered instead of forged or machined parts.

⑨ Soldering method cannot solve all problems. For example, the use of forming processes to manufacture angular structures can reduce the cost of materials, manufacturing and welding compared with welding methods.

2. What are the steps in the welding assembly of components?

① The oil, rust and dirt on the surface of the workpiece should be cleaned before welding;

② Check the fixtures, and the parts with gaps need to be repaired;

③ Clamp the workpiece to the welding position and keep the welding process stable;

④ Clamp the temporary fixture with the fixed fixture, so that the welding process is always maintained in the calibration position;

⑤ Preset joints to compensate for possible shrinkage during welding;

⑥ Pre-bend parts to compensate for any possible deformation during welding;

⑦ Use the positioning plate;

⑧ Sometimes the weldment can be cut into several parts, and each part can be welded so that each part of the weldment can be balanced at the neutral axis position;

⑨ When welding a large number of complex structures, each part of the components can be welded separately, which can make the final assembly easier to fix.

Before quenching: