28 Sep,2023
Tip: Basic principles for selecting welding rods
The welding rod consists of two parts: the welding core and the coating. A welding rod is a coating (coating) applied uniformly and centripetally on the metal welding core. Different types of welding rods result in different welding cores. The welding core is the metal core of the welding rod. In order to ensure the quality and performance of the welding seam, there are strict regulations on the content of various metal elements in the welding core, especially for the content of harmful impurities (such as sulfur, phosphorus, etc.), which should be strictly limited and superior to the base material. The composition of the welding core directly affects the composition and performance of the weld metal, so the harmful elements in the welding core should be minimized as much as possible.
The basic principles for selecting welding rods are as follows:
1.Equal strength principle: that is, select welding rods with the same strength grade as the base material. Generally used for welding low carbon steel and low alloy steel.
2.Same composition principle: Select welding rods with the same or similar chemical composition as the base material. Generally used for welding metal materials such as heat-resistant steel and stainless steel.
3.Principle of crack resistance: Use alkaline welding rods with good crack resistance to avoid cracks in the joints during welding and use. Generally used for welding structures with high stiffness, complex shapes, and dynamic loads during use.
4.Principle of anti porosity: Due to the limitations of welding process conditions, such as inconvenient cleaning of oil stains, rust, etc. at the joints of welding parts, acid welding rods with strong anti porosity ability should be selected to prevent bubbles from being trapped in the weld during the welding process, forming bubbles.
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