Generally, there are three common factors that cause pores in welds :
1 current problem
Porosity in common welds is mostly due to excessive current. There are many kinds of weld shapes: such as flat welding, vertical welding, horizontal welding, overhead welding, flat fillet welding, vertical fillet welding, base material thickness, groove shape, multi-layer welding, cover welding and so on. Regardless of the kind of weld you want to avoid porosity, the current must be adjusted appropriately. How to master the appropriate current standard? View should note the bath slag covering the bath liquid preferably about half, must not be less than one-third. This is because the molten iron during welding contains various gases. The gas in the molten iron protects the molten iron to slowly solidify through the covered liquid slag, so that the gas can escape outward.
2 Material problems produce very few pores because the base material is a low-quality material with high sulfur content, which causes the viscosity of the slag to increase, which affects the escape of gas. In addition, the high sulfur content produces more sulfur dioxide gas, and the production of pores is more important.
3 Surface cleanliness issues
Welding the unclean, rust, welding slag, residual oil and grease, but also a great chance porosity. Rust and gas welding slag are visible to the naked eye and easy to detect. There are many methods for detecting residual oil stains on metal surfaces, such as water-hanging method, copper sulfate method, and paint method. Shaanxi Prodi Surface Cleanliness Detector is a product that professionally quantifies the cleanliness of metal surfaces. It detects residual organic pollutants on the surface of metals (glass, ceramics , plastics, etc. ) through fluorescence measurement technology , such as oil stains, grease, cooling lubricants, etc. Cutting fluid, wax, etc., provide important relevant basis for improving the process and improving the quality of the process.
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