A welding method for stainless steel clad plate

Abstract

The invention discloses a welding method of a stainless steel composite plate, which comprises the following steps: Step 1: the base layer is a carbon steel layer, the compound layer is a corrosion-resistant alloy layer, double V-shaped grooves are opened, and the composite plates are butted; Step 2: adopt Plasma welding or laser welding welds the groove between the V-shaped groove on the side of the corrosion-resistant alloy layer and the V-shaped groove on the side of the carbon steel layer to form the inner weld of the base; step 3: use laser cladding technology Weld the bottom of the V-groove on one side of the corrosion-resistant alloy layer to form a transition layer weld; Step 4: Use MAG, TIG or laser cladding to weld the exterior of the transition layer weld to form a multi-layer weld; Step 5: Submerged arc welding is used to weld the V-shaped groove on one side of the carbon steel layer to form the outer weld of the base layer. The carbon steel layer adopts submerged arc welding + laser welding (or plasma welding) to ensure the penetration of the base layer while reducing the width of the inner weld seam in the base layer, thereby reducing the width of the bottom of the cladding layer, reducing the cladding amount of cladding, and improving welding efficiency. Save wire.

Description

Technical field: [0001] The invention relates to the technical field of layered structure bimetal welding, in particular to a welding method for a stainless steel clad plate. Background technique: [0002] With the increasing demand for energy, the exploitation of oil and gas in harsh corrosive environments has also gradually increased, and the problem of pipeline corrosion has become particularly prominent. Traditional single anti-corrosion technologies such as adding corrosion inhibitors, using plastic inner coatings and using non-metallic pipes, etc. , It has been difficult to meet the needs in terms of corrosion resistance, reliability and economic indicators. In order to solve the high H content 2 S / CO 2 Corrosion problems are faced in the exploitation of highly corrosive oil and gas fields and oil and gas transportation. Corrosion-resistant alloy pipes such as stainless steel and titanium alloys are widely used in corrosive environments such as petroleum, chemical, a...

AI Technical Summary

Problems solved by technology

Although this welding method solves the problem of low production efficiency caused by the large amount of cladding weld deposition, it has the problems of poor corrosion resistance and unstable low-temperature impact performance in narrow gap welding such as laser welding, and this welding method uses a single Double-sided molding for side welding, limited penetration depth, difficult to achieve welding of thick-walled composite plates

[0005] The Chinese invention patent published on October 26, 2018 with the publication number CN 108705200 A, the patent name is a welding method for stainless steel-lined composite panels, which uses double V-shaped grooves, through laser + submerged arc welding + TIG The method solves the problem of corrosion resistance of the base weld, but the transition layer uses TIG, and most of the energy of the arc is used to melt the base, resulting in the inability to effectively isolate the diffusion of Fe elements. For the technical requirements of more stringent dilution requirements, only the transition can be increased. The thickness of the stainless steel layer is used to ensure the alloy content of the stainless steel layer. In addition, TIG is filled with welding wire, and defects are prone to appear at the corners of the V-shaped groove; The mechanical properties of the seam deteriorate, which affects the low temperature impact stability

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