Safety operation rules of butt welding machine
07 Apr 2020
Safety operation rules of butt welding machine 1. The staff should be familiar with the welding process of the butt welding machine: (1) Continuous flash welding: continuous flashing, upsetting, and electric heating treatment on the welding machine after upsetting; (2) Preheating flash welding: one flash, preheating by firing, second flash, upset forging. 2. The operator must be familiar with the mechanical and technical properties used, as well as the location and application of the main components. 3. The operator should select the welding parameters according to the mechanical properties and welding material. 4. Weldment preparation: remove rust, oil and dust within 120 mm of the end of the steel bar. If the tip is bent, it should be straightened or cut off. 5. The Butt fusion welding machines should be installed indoors and should have reliable grounding (or zero connection). When multiple butt welding machines are installed together, the distance between the machines must be at le...
Do you konw flash butt welding
03 Apr 2020
The Butt fusion welding machines is divided according to the welding method: flash butt welding machine, steel butt welding machine, copper rod butt welding machine Welds are formed under the condition that the solid metal of the workpiece is plastically deformed to form common grains. The structure and composition of the weld are close to the base metal (or after heat treatment), and it is relatively easy to obtain equal strength and equal plastic welded joints. Flash butt welding mainly uses the contact resistance of the workpiece to heat the workpiece, the metal surface melts, the temperature gradient is large, and the heat affected zone is relatively small. The flashing process has the function of self-protection to expel air and reduce metal oxidation. Upsetting can also discharge oxides out of the weld with liquid metal. There are few defects such as weld inclusions and insufficient penetration. The flashing process has a strong self-adjusting function, lower requirements for mai...
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...