A major breakthrough! Wuchang Shipbuilding uses welding robots for the first time in duplex stainless steel ship construction

In order to achieve the goals of "improving quality", "reducing costs" and "increasing efficiency", the Wuchang Shipbuilding Ship Assembly Department of China State Shipbuilding Corporation has introduced new technology and equipment - trackless crawling welding robots.

Recently, the slipway workshop, support room and Wang Fei Skill Master Studio of the General Assembly Department debugged the equipment and welded the test plates, and made significant breakthroughs in the application of trackless crawling welding robots in the welding construction of duplex stainless steel ships. According to the manufacturer of the trackless crawling robot, this equipment has been exported to many foreign countries, but it is the first time it has been used in the welding of duplex stainless steel in China.

There are many difficulties in applying traditional manual welding technology to duplex stainless steel welding construction. In order to improve welding efficiency and welding quality, the general assembly department applied the trackless crawling welding robot to the vertical docking of the duplex stainless steel cargo tank of the 7200DWT chemical tanker No. 3. During the welding process, through continuous debugging and improvement of the trackless crawling welding robot, the construction personnel explored the optimal welding parameters for duplex stainless steel and overcame a series of technical difficulties.

The continuous advancement of welding robots in real ship welding work has the following advantages:

1. The trackless crawling welding robot can continuously weld with short interruption time and increase the welding efficiency by more than 50%;

2. The welding quality of the trackless crawling welding robot is stable. The welded seams can pass the PT test in one pass, and the overall construction efficiency is increased by more than 70%;

3. Anti-fall measures are designed and installed for trackless crawling robots to make the welding process safer;

4. The trackless crawling robot is equipped with a modified carbon dioxide welding machine, which can be used on the dock. The welding construction is simpler. After the improvement, only one person is needed to operate it, which effectively saves labor costs.

5. The welding robot can obtain the best shape of the weld by optimizing relevant parameters, greatly shortening the grinding time of vertical welds, and the pass rate of visual inspection of welds is nearly 100%, effectively reducing the grinding workload;

6. Reduce the labor intensity of the welder. The welder only needs to hold the remote control to make occasional corrections to the robot, and stay away from direct damage from arc light, smoke, spatter and toxic gases generated during the welding process, reducing the probability of occupational diseases.

For the first time, a welding robot has been applied on a real ship in the dual-phase stainless steel butt weld of the cargo tank of the 7200DWT chemical tanker No. 3. This marks a breakthrough in the application of robot welding in stainless steel ships and will contribute to the improvement of Wuchang Shipbuilding. The level of "three modernizations of shipbuilding" and the degree of informatization have a great promotion effect.

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