The best weldability of steel - low carbon wear-resistant plate
Carbon wear-resistant plates include ordinary low-carbon wear-resistant plates, high-quality low-carbon wear-resistant plates, low-carbon boiler steel, as well as low-carbon container steel, bridge steel and so on. Carbon content less than 0.25%. Because the low carbon wear plate has low carbon content and good weldability, it is usually not necessary to take special process measures to obtain high-quality welded joints.
Welding quality
Among them, cold-rolled plate, hot-rolled plate, galvanized plate, channel steel four materials are low carbon steel. Low carbon wear-resistant plate is characterized by low carbon content, Mn and Si content is relatively small usually not due to welding in the heat affected zone hardening structure, steel plasticity is better, welded joints have a small tendency to crack, so they are the best weldability of steel. Just pay attention to a few aspects to ensure the welding quality of the weld:
(1) Before removing rust, oil, water and other impurities on the surface of the weldment, the welding rod and flux must be dried.
(2) Deep and narrow groove forms should be avoided in the first layer weld and single pass weld of welding seam and butt multi-layer welding to prevent defects such as cracks, incomplete welding and slag inclusion.
(3) The stiffness of the structural parts increases, and the crack tendency of the weld also increases, so when welding the structural parts with large stiffness, it is appropriate to choose the low-hydrogen alkaline electrode, preheating before welding or stress relief heat treatment measures after welding.
(4) When the ambient temperature is lower than -10 ℃, the joint cooling speed is faster. In order to prevent cracks, the following measures should be taken to slow down the cooling speed: ① Preheat before welding, maintain the interlayer temperature during welding; ② Use low hydrogen or ultra-low hydrogen welding materials; ③ The welding current must be increased when the spot welding, the weld section and length of the spot welding must be appropriately increased, and the welding page should be preheated if necessary; ④ The whole weld is welded, try to avoid interruption, and fill the arc pit when extinguishing.
Welding process
Since the low carbon wear-resistant plate is the best weldability of steel, various welding methods are used in the welding of low carbon wear-resistant plates. Such as manual arc welding, submerged arc welding, carbon dioxide gas welding, electroslag welding, gas welding, resistance welding, argon arc welding, brazing and so on. Among them, manual arc welding, carbon dioxide gas shielded welding, argon arc welding, submerged arc welding and so on are commonly used.
