Welding of stainless steel composite steel plates
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Looking at the design drawings of Tianchenyuan, it is a stainless steel composite steel plate container. The composite layer has been removed within 20mm on both sides of the welding groove of the cylinder. May I ask why this is done? Are you not afraid of corrosion in the future?
This is the space left for surfacing during butt jointing. You can check whether there are welded joints in the component drawing. If there is no welding joint, it means that the drawing is unqualified.
This is the welding procedure requirement. You just need to check whether it is consistent with the welding procedure qualification report. The composite plate welding process is generally 1. First use a stainless steel electrode to weld the upper part of the base metal (the side close to the composite layer), that is, transition welding, and clean the slag after welding. Removing part of the cladding layer may be a requirement of the welding seam structure, which can ensure that the cladding layer is not affected during transition welding, and this part of the cladding layer will be replaced by a welding seam in the end. 2. Use stainless steel electrodes to weld the cladding. 3. Clean some welds of the base metal and weld the base metal with a welding rod made of the base material. The welding requirements of composite panels are to ensure the welding strength of the cladding, parent layer and junction parts, and to avoid the base metal components in the molten cavity entering the cladding during transition welding, causing changes in the chemical properties and performance of the cladding.
Is 20MM a lot of space? Looking at the regulations of HG20583 and SH/T3527, there is no such regulation as 20MM. Thank you!
This depends on the specification and material of your plate, the size of the weld structure and the material of the welding rod you designed. Before the welding design is officially implemented, welding process evaluation must be carried out, that is, experiments and tests must be conducted to determine whether the welding seam form, welding materials and welding process control used in the design can meet the requirements of relevant standards and equipment design. So I’m not afraid if there are any problems now. Unless you are in the manufacturing department, then you need to work hard.
There is no standard to clearly define this size, but 20mm is not a large space.
If it is stainless steel or carbon steel, there is no need to remove the composite layer within 20MM on both sides of the cylinder welding groove. Weld the base layer first, then use stainless steel electrodes to weld the transition layer when approaching the cladding layer. Finally, the covering surface is enough. If it is a composite of non-ferrous metal and carbon steel, it needs to be removed.