During the welding process, welders can see a layer of covering material floating on the surface of the molten pool, which is commonly known as welding slag. How to distinguish welding slag from molten iron is very important for beginners. I think it should be distinguished in this way.
First, welding slag is the product of the melting of the electrode coating and the high-temperature metallurgical reaction of the weld. Welding slag is mainly composed of metal oxides or non-metal oxides and other mineral salts. Since its density is much smaller than that of the liquid iron during welding, the welder can easily observe a layer of floating material on the upper part of the molten pool during the welding process. In terms of color, it is darker than the liquid iron in the molten pool, and flows in the opposite direction of the welding direction and on both sides of the rear, and cools down as the welding continues to become welding slag.
Xinfa welding equipment has the characteristics of high quality and low price. For details, please visit: Welding & Cutting Manufacturers - China Welding & Cutting Factory & Suppliers (xinfatools.com)
Second, the welding slag plays a major role in protecting the weld bead during the welding process. The slag covers the liquid metal in the molten pool to separate the liquid metal from the air, preventing the intrusion of harmful gases such as oxygen, nitrogen, and hydrogen in the air, thereby protecting the weld bead. Therefore, during the welding process, you must pay attention to the welding angle to ensure that the welding slag flows to the back and both sides of the back, so as to observe the formation of the weld, avoid the generation of defects such as slag inclusions and pores, and ensure the welding quality. Third, according to an experienced welder on site, if you want to identify the molten iron during welding, you only need to observe carefully and you will find that the welding slag floating on the liquid iron is like oil in the water, floating on the molten pool, which is very easy to identify.
Post time: Sep-05-2024
