Welding Techniques for Metal Sintered Filter Elements

Firstly, the welding of metal sintered filter elements is one of the most crucial steps in their manufacturing process, as it directly affects the filtration performance and service life of the filter elements. During the welding process, high-precision welding techniques must be employed to ensure the roundness and aesthetic appearance of the weld seams, thereby guaranteeing the integrity and stability of the filter elements.

Before welding, thorough preparations are necessary. The surface of the stainless steel plate must be cleaned thoroughly to remove impurities, oil stains and oxide layers, ensuring the quality of the weld points. The electrode pressure should be adjusted according to the thickness of the plate, with light pressure for thin plates and heavy pressure for thick plates, to ensure the plates are in close contact. Additionally, the welding environment should be kept clean to prevent impurities from entering the weld seam.

During the welding process, there are several key points that need to be noted:

Adjustment of welding time and current: The welding time needs to be adjusted according to the different requirements of the solder joints. The current should be gradually increased from small to large until a perfect current is achieved. The welding time and current control of industrial frequency AC resistance welding machines and medium frequency spot welding machines are different, and adjustments need to be made based on specific circumstances.‌

Welding environment protection: During the welding process, the weld seams need to be carefully smoothed to ensure their roundness. The welding environment should be protected by using argon gas to prevent the local burn of the sintering net, which could lead to a decline in the filtering effect of the filter element.

Requirements for welding equipment and techniques: The entire welding process relies on professional welding fixtures and advanced welding equipment, and the welding skills of the workers are also highly demanding. Once the welding is completed, the filter element needs to undergo a bubbling test to check for any air leakage within the pressure range.

Finally, the quality inspection after welding is also very important. The filter element needs to undergo a bubbling test to check if there is any air leakage within the pressure range. Once a problem is identified, the entire filter element will be scrapped, which further highlights the significance of the welding process in the manufacturing of sintered filter elements.