Application of laser hybrid welding in shipbuilding industry

With the continuous research and innovation of welding technology, a high-quality and high-efficiency welding technology has been continuously applied in the field of shipbuilding manufacturing. This is a new type of special welding method--laser--MIG hybrid welding . We know that in the metal joining technology process, on the one hand, the welding speed is high and the deformation is small, on the other hand, there is a good weld bridging ability. Everyone knows that the traditional single laser welding process is impossible to solve the above problems.

There is no doubt that the development of laser welding and gas metal arc welding processes has been around for a long time and they have a wide range of applications in material joining technology. Laser hybrid welding combines these two welding techniques (laser welding and arc welding) organically to achieve excellent overall performance, improving the welding quality and production process while improving the cost-benefit ratio. At present, laser hybrid welding has achieved remarkable results in the shipbuilding industry, and the economics of this technology is also very attractive. It is especially important that laser hybrid welding has high welding precision and can achieve very good mechanical/process performance. The laser power supply for hybrid welding can be equipped with different laser sources. At present, the main research is to combine CO2 laser, YAG laser, fiber laser and GMAW process. How to use the laser hybrid welding trolley of the weld seam tracking system to weld long welds is mentioned in the research schedule.

1 Introduction

High quality and high efficiency, low deformation and easy assembly, laser welding has broad prospects in the welding of steel structural parts. Laser arc hybrid welding technology can improve the weld bridging ability, which is of great significance for welding with large gap. The development and application of laser welding and gas metal arc welding have been around for a long time. They have been widely used in the industrial field and material joining technology. The two welding methods are the process of energy transfer to the workpiece and the formation of energy flow. They all differ to form their specific application areas.

Laser beam welding transfers energy from the laser emitter to the workpiece through the fiber. Arc welding uses large currents to transfer energy through an arc column. The welding heat affected zone of laser welding is very narrow, and the aspect ratio of the weld is very high. Due to its small diameter of focus, the weld bridging ability of laser beam welding is poor. On the other hand, the welding speed of laser beam welding is very high.

The energy density of arc welding is relatively low, so that the diameter of the focus on the surface of the workpiece is relatively large, and the welding speed is relatively low. Laser hybrid welding combines these two welding techniques organically to obtain excellent comprehensive performance, and improve the cost efficiency ratio while improving welding quality and production processability. At present, laser-composite welding has achieved remarkable results in the automotive industry, and the economics of this technology in the shipbuilding industry are also very attractive: higher connection speed and very good mechanical/process performance.

As early as the 1970s, people knew how to combine laser and arc organics in one process. But since then, for a long period of time, no further research has been conducted. Recently, people have once again turned their attention to this topic and tried to develop laser hybrid welding technology. Of course, one of the reasons for this is that in the early days, lasers have not been widely used in the industry, and now lasers have become standard equipment in many factories.

The welding technique of laser welding combined with another welding method is called laser hybrid welding, and the laser beam and the arc simultaneously act on the welding zone to influence and support each other. The current research direction is to explore a wider and deeper application field for this process. A typical example is the application of the CO2 laser GMA hybrid welding process to the shipbuilding industry. Here we demonstrate the possibility of applying and discussing this application area.

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