In fact, the field of 45# seamless steel pipe is closely related to many individual industries, such as automobile manufacturing and machinery manufacturing. Vehicles, mechanical equipment manufacturing and other mechanical equipment that have high requirements on the precision and smoothness of 45# seamless steel pipes. High-precision 45# seamless steel pipe customers are not only customers with high precision and smoothness requirements, because 45# seamless steel pipes are high-precision, and the dimensional tolerance can be maintained at 2-8 wires, so many machining and manufacturing customers order more To save labor, material and time consumption, the seamless splicing of 45# seamless steel pipe or round steel is slowly being transformed into 45# seamless steel pipe. So let's take a look at the laser welding processing steps of 45# seamless steel pipe.
Laser welding processing technology of 45# seamless steel pipe: heat treatment before electric welding and heat treatment after coal welding
1. Warming up
Before 45# seamless steel pipe electric arc welding, the 45# seamless steel pipe is mainly heated up, and the temperature is controlled for 30 minutes and then slowly welded. The heating of electric arc welding and virtual beam damp heat treatment are handled by the temperature control cabinet with automatic operation process. Use far-infrared rays to track and heat-treat the electric furnace plate. Intelligently actively set data charts and record data charts, and the heat transfer coefficient accurately measures the temperature. When the temperature is raised, the distance between the measurement points of the heat transfer coefficient and the welding edge of the electric welding is 15mm-20mm.
2. Welding process
1. In order to prevent the welding deformation of the 45# seamless steel pipe faster and faster, each column joint is welded symmetrically by two people, and the welding direction is from the inside to both sides. Electric welding and welding inner expansion inlet (electric welding welding is close to the beam when the inner expansion inlet is enlarged) Operation steps: From the first layer of 45# seamless steel pipe to the third layer of 45# seamless steel pipe, carry out small-sized models as much as possible, because its electric arc welding seriously threatens welding The key reason for deformation. After arc welding - to the third layer, back planing should be carried out. After carbon gouging is used, try to grind and polish the welding equipment, and carry out induction hardening treatment on the welding surface to show the metallic luster and prevent the surface from carbonization to cause cracks. The outer hole is electric-welded once, and the other thread is electric-welded once.
2. When electric arc welding = double-layer 45# seamless steel pipe, the direction of electric welding welding should be reversed to that of layer 45# seamless steel pipe, and so on. The welding distance of each layer is 15-20mm.
3. The welding current and welding speed of several fierce machines should be maintained and the number of superimposed layers of superimposed accumulated snow should be maintained.
4. In arc welding, try to weld slowly from the arc-leading plate, and complete the welding on the arc-leading plate. After electric arc welding, disconnect, grind and polish to remove.
3. After heat treatment
After electric arc welding, the heat treatment process should be completed within 12 hours. If the heat treatment of 45# seamless steel pipe cannot be solved immediately, suggestions for heat insulation and cold reduction should be sought. When carrying out the heat treatment process, the ambient temperature of the two heat transfer coefficients should be accurately measured, and the heat transfer coefficients should be welded on both sides of the welding.
The above is the laser welding processing steps of the 45# seamless steel pipe that the author introduced to you in detail. I hope that after reading it, everyone can have a certain understanding of the production and processing steps. When the 45# seamless steel pipe is heat treated at the end, it is also necessary to know whether other operations are needed, and it is not possible to ignore the process with one's own bias.
