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How to prevent blow holes in cooler welding

Source: http://le-signal.com/ Time: 2019-03-26

Air holes, slag inclusions, welding cracks, incomplete penetration, non-fusion, external dimensions and shapes of welds do not meet requirements, undercuts, welding knobs, arc craters, etc. are common defects of coolers. Depending on their location, the treatment methods are different. So, today's air cooler manufacturers first introduce the related content of the blowhole problem in cooler welding through the following.

Porosity refers to the voids formed when the bubbles in the molten pool fail to escape during solidification during welding. Air cooler manufacturers analyze the main reasons for the occurrence of porosity: the bevel edge is not clean, there is water, oil stains and rust marks; the electrode or flux is not baked according to regulations, the core is corroded or the coating is deteriorated, peeling, etc. In addition, when welding with low-hydrogen electrodes, the arc is too long, the welding speed is too fast, etc., it is easy to generate porosity during the welding process. Due to the existence of pores, the effective cross section of the weld is reduced. Excessive pores will reduce the strength of the weld and damage the compactness of the weld metal.

The method to prevent the generation of pores is: Air cooler manufacturers choose the appropriate welding current and welding speed, and carefully clean the moisture, oil and rust on the edge of the groove. Store, clean and bake welding materials in strict accordance with regulations. Do not use deteriorated electrodes. When the electrode coating is found to be deteriorated, peeled or the core is rusted, the scope of use should be strictly controlled. When submerged arc welding, appropriate welding process parameters should be selected, especially for automatic welding of thin plates, and the welding speed should be as small as possible.

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