With the continuous development of shipbuilding industry, the application of port machinery forgings in shipbuilding is more and more extensive. As an important link in the manufacturing process of mechanical forgings, welding is of great significance to improve the quality, performance and reliability of forgings. This paper aims to discuss the welding technology of ship port mechanical forgings, in order to provide theoretical support for improving the quality and performance of forgings.
Welding technology is an indispensable part of the manufacturing process of mechanical forgings. The traditional welding technology mainly includes manual arc welding, gas shielded welding, laser welding and so on. Although these technologies have achieved certain results in the manufacture of mechanical forgings, there are still some problems. For example, manual arc welding is inefficient and easily affected by environmental factors; Gas shielded welding has higher requirements for gas purity and protection effect. Laser welding has the problems of expensive equipment and high requirements for workpiece assembly accuracy.
In order to overcome the shortcomings of traditional welding technology, a new welding technology of ship port machinery forgings – “double arc and double protection” welding technology is proposed in this paper. The technology adopts two arc columns and two shielding gases to improve welding efficiency, reduce welding deformation, refine weld grain and reduce welding stress. The specific implementation process is as follows:
Place the mechanical forgings to be welded in the welding fixture to ensure the stability and reliability of the workpiece;
The adjustable arc pillar 1 is used to preheat the area to be welded to a predetermined temperature;
Reduce the height of arc pillar 1 and start arc pillar 2 at the same time to form two arc pillars in the area to be welded;
Adjust the current intensity of arc column 1 and arc column 2 to make them conform to the preset welding process parameters;
Protect the two arc columns to prevent the outside gas from entering the welding area;
Control the moving trajectories of two arc columns to ensure the stability and continuity of welding process;
Close arc pillar 1 and arc pillar 2 and wait until welding is complete.
In order to verify the feasibility of “double arc and double protection” welding technology, we have carried out experiments to verify the technology. The experimental results show that compared with the traditional welding technology, the “double arc and double protection” welding technology has higher welding efficiency, lower deformation, finer weld grain and smaller welding stress. Specifically, the use of “double arc double protection” welding technology can increase the welding efficiency by more than 20%, reduce the deformation by more than 15%, refine the weld grain by more than 10%, and reduce the welding stress by more than 15%.
The welding technology of “double arc and double protection” has a wide application prospect in the field of shipbuilding port machinery forging. First of all, the technology can improve the welding quality and reliability of mechanical forgings, reduce the product defect rate, and improve production efficiency. Secondly, the technology can reduce the labor intensity of workers, improve the working environment, improve production safety and environmental protection. Finally, the application of this technology can promote the upgrading and development of the shipbuilding port machinery forging industry and improve the overall competitiveness of China’s machinery manufacturing field.
In short, the “double arc and double protection” welding technology has high application value and development potential in the manufacture of ship port machinery forgings. In the future, the process parameters, equipment configuration and production flow of the technology can be further optimized to improve its adaptability in various mechanical forging manufacturing scenarios. At the same time, the training and introduction of relevant technical personnel should be strengthened to provide a strong guarantee for the promotion and application of “double arc and double protection” welding technology.
