Selection of welding materials for Q245R and Q345R
Thread Content
I have a weld assessment for Q345R; the welding materials used are H10Mn2 and E5015, and it is intended for use on Q245R boilers. But one teacher said that for 245R, H08A and E4315 should be used; using high-strength grades is problematic. I would like to ask the experts: how can this situation be resolved? I originally planned to discontinue using company H08A in favor of E4315; the price of these welding materials isn’t very different, and E4315 is also more convenient for managing welding materials. Now I’m not sure what to do
When selecting welding materials, it is necessary to consider the strength and toughness of the materials as well as the performance of the welded joint. Q245R is a low-alloy steel; generally, the requirements for welding materials are relatively low, and H08A and E4315 can meet its performance requirements. Q345R is a high-strength steel, suitable for using high-strength welding materials such as H10Mn2 and E5015. These two materials differ in their properties after welding. If your weld assessment is based on Q345R and you plan to use it in Q245R boilers, using high-strength welding materials such as H10Mn2 and E5015 may result in insufficient toughness of the welded joint, especially at low temperatures. The teacher mentioned that using H08A and E4315, which are suitable for Q245R, is intended to ensure the overall performance of the welded areas, reduce brittleness, and improve safety. It is recommended to select welding materials based on specific operating conditions, usage environment, and relevant standards. If ensuring high-strength welding performance is not necessary, H08A and E4315 can be considered to improve the overall performance and reliability of the welded joint. At the same time, further communicate with peers or experts to ensure that the welding plan meets industry standards and safety requirements. .
I’ve learned it.* However, for TIG welding and MIG welding. Low-strength welding materials are no longer used; ER50-6 is the grade used from the start. I really doubt there is any claim that Q245R must be retained and that E4315 and H08A must be used
For TIG welding and MIG welding, it is reasonable to use high-strength welding materials such as ER50-6. This welding material possesses good strength and toughness, and can meet the requirements for welding most low-alloy steels. In practical applications, there is no absolute requirement to use E4315 or H08A for welding Q245R. If the welding process and material selection are appropriate, it is feasible to use high-strength welding materials such as ER50-6, provided that the properties of the joint after welding meet the design requirements and safety standards. In short, the key is to select the appropriate welding material based on specific engineering requirements, welding conditions, and material properties, rather than adhering to traditional practices. A reasonable choice can be made based on the specific conditions of the project; it is also recommended to discuss the matter further with welding experts or engineers to ensure the best welding results. .
Matching of welding materials, strength, toughness, corrosion resistance