I want to know what kind of materials and what kind of welding rods are used

E43XX series for welding Q235 steel (HPB235 steel)； E50XX series for welding between Q345 steel (HRB335, HRB400) ； E43XX series for welding between Q235 and Q345. 1. Welding principles of general carbon steel and low alloy steel: 1. The strength of the welded joint should be greater than the lowest strength of the steel to be welded. 2. The plasticity and impact toughness of the welded joint should be no less than that of the steel to be welded. 3. In order to prevent welding cracks, the welding process should be selected based on the base material with poor weldability. 2. Low alloy Welding of gold steel and austenitic stainless steel 1. Generally, austenitic stainless steel electrodes with higher chromium and nickel content than the base metal and better plasticity and crack resistance are used. 2. For unimportant weldments, electrodes corresponding to stainless steel can be used. 3. Welding of stainless steel composite steel plates 1 .It is recommended to use welding rods with three different properties: base layer, transition layer, and cladding layer. 2. Generally, the base layer of the composite steel plate is not in direct contact with the corrosive medium. Structural steels such as carbon steel and low alloy steel are commonly used, so the corresponding grade of structural steel can be used for the welding of the base layer. Welding rod 3. The transition layer is at the junction of two different materials. An austenitic stainless steel electrode with higher chromium and nickel content than the composite steel plate, better plasticity and crack resistance should be selected. 4. The composite layer is in direct contact with corrosive media, so the corresponding austenitic stainless steel can be selected.

Senior, there is a crack in the gland of a piece of equipment here. The material is carbon steel. Can it be welded with a welding rod? After welding, does the strength still meet the requirements? The pressure is about 6 kg

If it is carbon steel, you can use low carbon steel electrodes for repair welding. Before welding, you need to grind out the cracks and grind out the grooves. If the welding quality is guaranteed, it can meet the original strength requirements. If it is cast iron, nickel-based electrodes can be used for repair welding. The diameter of the electrode should be small and small welding process parameters should be selected. Regardless of the repair welding, it is recommended to conduct surface flaw detection after welding. Penetrant or magnetic powder can be used for carbon steel, and penetrant can be used for cast iron. This post was last edited by zxz017 on 2007-12-22 13:21 ]

Thank you thank you thank you thank you

If cast iron is welded, insulation is very critical, otherwise problems may easily occur.