Advantages of Butt Welder
28 Mar 2020
Butt welding machine actually uses the resistance to generate heat when the workpiece is in contact with the mouth, thereby heating the workpiece and melting the metal surface, and the weld is formed under the condition that the solid phase metal of the workpiece is plastically degenerated Grain, weld structure, and composition are close to the base metal, so it is relatively easy to obtain equal-strength isoplastic welded joints. In the process of flashing, it has the self-protection function of exhausting air and reducing metal oxidation, so that defects such as weld inclusions and incomplete penetration are less. Advantages of Butt Welder 1.High welding efficiency. Because the workpiece is compacted with a double-force cylinder, its response speed is significantly faster than that of a hydraulic cylinder. 2.Automatic centering function. Ensure that the distance between the two ends of the pipe string and the two chip ends before welding is consistent, so as to ensure the same amount...
9 points to prevent welding deformation
20 Mar 2020
1. Reduce the cross-sectional area of the weld and, on the premise of obtaining a complete weld with no defects beyond the standard, use a smaller bevel size (angle and clearance) as much as possible. 2. Welding method with small heat input. Such as: CO2 gas shielded welding. 3. For thick plate welding, multi-layer welding is used instead of single-layer welding. 4. In the case of meeting the design requirements, the welding of longitudinal stiffeners and transverse stiffeners can be interrupted. 5. When both sides can be welded, double-sided symmetrical grooves should be used, and in multilayer welding, the welding sequence is symmetrical to the axis of the component and the axis. 6. When the thickness of the T-shaped joint is large, the beveled butt weld is adopted. 7. Adopt the anti-deformation method before welding to control the angular deformation after welding. 8. Use rigid fixture fixation method to control the deformation after welding. 9. Adopt the reserved length method of t...
Rebar welding principles
14 Mar 2020
1. The joint should be set as far as possible in the place where the force is small, and the key part of the structure where the force is large should be avoided. In the seismic design, avoid the beam-end and column-end stirrup reinforcement ranges. If it is necessary to connect in this area, mechanical connection or welding should be used. 2. There should be few connection joints on the same reinforced bar in the same span or the same floor height, and it is not appropriate to set up 2 or more joints. 3. The joint positions should be staggered from each other. Within the connection range, the percentage of the joint reinforcement area should be limited to a certain range. 4. Necessary structural measures should be taken in the area of steel reinforcement connection, and transverse structural steel bars or stirrups should be arranged within the overlapped length of the longitudinally stressed steel bars. 5. Axial tension and small eccentric tension members (such as truss and arch tie r...
Rebar welding rules
06 Mar 2020
1. According to the design requirements, the welding method of the engineering reinforcement connection is selected. The welding methods are mainly arc welding and flash butt welding, and arc welding is the main method. 2. Prior to welding construction of steel bars, rust spots, oil stains, and debris on the surface of steel bars, steel plate welding areas, and the areas where steel bars are in contact with electrodes should be removed. When the end of the steel bar is bent or twisted, it should be straightened and cut off. 3. For flash butt welding and arc welding of ribbed steel bars, longitudinal ribs should be placed and welded to longitudinal ribs. 4. The flash butt welding of steel bars should be selected with appropriate adjustment of elongation, firing retention, upset forging retention, and transformer stages. After the process parameters are determined, they should not be arbitrarily changed. 5. The arc welding of this project adopts the form of lap welding. When the conditio...
Precautions for steel bar welding process construction
29 Feb 2020
1. Before operation, check whether all tools, electric welders, power switches and circuits are good, whether the metal casing is safely and reliably grounded, whether the inlet and outlet wires have a complete protective cover, and whether the inlet and outlet ends are welded with copper joint welding heads. 2. Each welding machine should have a dedicated power control switch and a secondary protection device. It is strictly forbidden to replace other fuses with fuses, and cut off the power supply after completion. 3. The steel bars are all machined and bent according to the design size and shape, the steel bar processing site is hardened, and a rainproof shed is set up. 4. The rebar batching card must be approved by the technical supervisor before the material is allowed to open. The rebars that have been formed are listed in the order of the drawing numbers and stacked neatly. The rust prevention measures shall be taken at the storage site of the rebar. 5. Clean the surface oil stai...
Key points of construction technology of steel bar welding
22 Feb 2020
In the construction of modern buildings, the welding of steel bars is widely used. Common welding methods for steel bars include flash butt welding, arc welding, and electroslag pressure welding. The welding quality of steel bars is related to the weldability of the steel and the welding process. This article briefly discusses the construction technical points of steel bar welding. Welding process The welding process includes arc initiation, stabilizing arc, electroslag, and top pressure. Before welding, the rust in the end of the steel bar should be removed within about 120mm, the clamp should be clamped on the lower steel bar, and the upper steel bar should be straightened. Hold firmly in the moving electrode and fill the flux box with flux. When manual electroslag electric pressure welding is used, the direct arc initiation method can be used. First, the upper and lower steel bars are contacted. After the welding power is turned on, the upper steel bar is lifted by 2 to 4 mm immedia...