As the core component of the bearing equipment and the key structure to resist grease erosion and mechanical stress, the choice of welding process is directly related to the sealing and overall strength of the oil press base shell. The essence of the welding process is to combine the stainless steel plates at the atomic level by heating, pressurizing or both. Different welding processes have different energy input and fusion methods, which ultimately have different effects on the performance of the base shell. Taking the common manual arc welding as an example, it uses the arc heat generated between the welding rod and the weldment to melt the metal, and has high operational flexibility. However, due to the uncertainty of manual operation, it is easy to fluctuate in weld formation and penetration control, thus affecting the sealing and strength.
Argon arc welding is a widely used process in stainless steel welding. It uses argon as a protective gas to effectively isolate the oxidation of the molten pool by air, which can greatly improve the corrosion resistance of the welded joint. This is very important for the oil press base shell that is in long-term contact with grease and prone to chemical corrosion. In terms of sealing, the argon arc welding arc is stable and the molten pool is precisely controlled, which can achieve high-quality weld formation. The weld surface is smooth and flat, and it is not easy to produce defects such as pores and cracks, effectively avoiding grease leakage. At the same time, due to the argon protection, the weld metal composition is uniform and the structure is dense, which enhances the strength of the weld, so that the base shell can still maintain structural integrity under the external forces such as vibration and pressure during the operation of the equipment.
Laser welding relies on high-energy-density laser beams to quickly melt stainless steel materials, with fast welding speed and small heat-affected zone. This feature has unique advantages in ensuring the overall strength of the oil press base shell. The small heat-affected zone means that the structure and performance of the surrounding materials change less during the welding process, reducing the dimensional deviation and structural stress concentration caused by thermal deformation, and maintaining the stability of the overall structure of the base shell. In terms of sealing, laser welding can achieve deep fusion welding, forming a narrow and deep weld. The weld is tightly combined with the parent material, which can effectively prevent grease penetration. However, laser welding equipment is expensive and has strict requirements on assembly accuracy. In actual production, cost and performance requirements must be comprehensively considered.
Resistance welding uses the resistance heat generated by the current passing through the weldment to heat the contact part to a plastic or molten state, and then applies pressure to complete the welding. For the thin plate welding of the oil press base shell, resistance welding can quickly form a continuous weld with high production efficiency. The density of its welding spot is good, which ensures the sealing to a certain extent and prevents grease from seeping out of the welding part. In terms of strength, reasonable control of the welding parameters of resistance welding, such as current, welding time and pressure, can make the welding spot have sufficient strength, work together with the parent material, and jointly bear the load during the operation of the equipment. However, if the parameters of resistance welding are improperly set, problems such as cold welding and insufficient strength of welding spots are prone to occur, which will affect the overall performance of the base shell.
The operating specifications and quality control in the welding process also affect the sealing and strength of the oil press base shell. Before welding, thoroughly clean the impurities such as oil stains and rust on the surface of the stainless steel plate to avoid defects such as pores and slag inclusions during welding and ensure the quality of the weld. During the welding process, strictly control the parameters such as welding speed, electrode angle, current size, etc. to ensure that the weld is uniform and continuous and reduce the occurrence of welding defects. Grinding and polishing the weld after welding can not only improve the appearance quality, but also eliminate the tiny cracks and protrusions on the weld surface, enhance the sealing, and make the stress distribution more uniform and improve the overall strength.
The combined application of different welding processes also provides ideas for optimizing the performance of the oil press base shell. For example, in some complex structural parts, argon arc welding is first used for base welding to ensure the fusion quality and sealing of the weld root, and then manual arc welding is used for filling and cover welding to improve welding efficiency and adaptability. This combination method can not only give play to the advantages of argon arc welding in ensuring quality, but also take advantage of the flexibility of manual arc welding to achieve a better balance between the sealing and strength of the base shell, and meet the needs of long-term stable operation of the oil press.
The welding process profoundly affects the sealing and overall strength of the oil press base shell from multiple dimensions. Whether it is advanced processes such as argon arc welding and laser welding, or traditional processes such as resistance welding and manual arc welding, they must be reasonably selected according to actual production and performance requirements, and the operation and quality control during the welding process must be strictly controlled, and even a combined welding strategy can be adopted. Only in this way can the oil press base shell be ensured to have reliable sealing and sufficient strength, providing a solid guarantee for the efficient and stable operation of the oil press.
