Pressure vessels and heat exchangers are characterized by a large-thickness steel structure, obtained by bending steel sheets of thickness 20 – 250 mm. The production of such equipment does not require high productivity but needs to meet the high-precision tolerances defined by stricter international standards such as ASME.
High pressure vessel for CO2 extraction machineThe key procedure of the plate rolling machine in the process of producing the composite steel plate pressure vessel is pre-bending and rolling the plate to finally obtain the required tolerance and facilitate welding into a tube.
Welding requirements for clad steel platesThe clad steel plate is a bimetallic plate made of stainless steel, nickel-based alloy, copper-based alloy, or titanium plate as the clad layer, and pearlitic steel as the base layer, which is made by explosive welding, clad rolling, surfacing, and other methods. The base layer of the composite steel plate should meet the requirements of joint strength and stiffness, and the cladding layer should meet the requirements of corrosion resistance. In order to ensure that the composite steel plate does not lose its original comprehensive properties, the base layer and the cladding layer must be welded separately.
The welding at the junction of the base layer and the cladding belongs to dissimilar steel welding, and its weldability mainly depends on the physical properties, chemical composition, joint form, and filler metal composition of the base layer and the cladding. At present, the clad steel plate with austenitic stainless steel as the clad layer and pearlite as the base layer is the most widely used, followed by the clad steel plate with ferritic steel as the clad layer and pearlite as the base layer.
Welding method of composite steel plateUsually, there are electrode arc welding, submerged arc welding, tungsten argon arc welding, CO2 gas shielded welding, and plasma arc welding. At present, the cladding is usually welded by argon tungsten arc welding or electrode arc welding, and the base layer is welded by submerged arc welding or electrode arc welding.
Groove form of clad steel plate weldingThe butt joint groove form can be V-shaped, X-shaped, V, and U-combined grooves. The backside of the joint can also be machined at short intervals to remove the cladding metal to ensure that the base weld bead is not welded to the cladding when welding the base bead. Generally, X-shaped groove double-sided welding is used as much as possible, first welding the base layer, then welding the transition layer, and finally welding the cladding layer. In order to ensure that the welded joint has good corrosion resistance.
At the same time, considering the welding characteristics of the transition layer, the welding workload on one side of the cladding layer should be minimized. Whether the cladding is on the inside or the outside, the base layer is welded first. When the cladding is on the inner side, the base welding root shall be cleaned from the inner side before welding the cladding. When the cladding is on the outside, the last weld bead of the base layer shall be polished. When welding the cladding, first weld the transition layer, and then weld the cladding.
Filler Metal Selection for Welding of Clad Steel PlatesIn most cases, a suitable intermediate filler metal is selected as the transition layer of the steel, so as to control the iron content of the final weld bead of the cladding metal, avoid embrittlement and cracks in the weld bead at the cladding and the base layer, and ensure the cladding welding. Corrosion resistance, wear resistance, and other special properties.
CO2 extraction vessels 4 welding process sequences of clad steel platesWith high quality products and considerate service, we will work together with you to enhance your business and improve the efficiency. Please don't hesitate to contact us to get more details of Titanium Clad Steel Plate.