Fiber laser welding machine manufacturers analyze how welding cracks are generated

April 04 15:41 2023

Fiber laser welding machine manufacturers analyze how welding cracks are generated?

As a manufacturer of fiber laser welding machines for many years, we often encounter customers asking why there are slight cracks in titanium alloy welding. The following is a detailed explanation of the reasons for the cracks and the treatment methods for this welding crack problem.

Under normal circumstances, welding cracks are titanium alloy materials, and other materials basically do not have such problems. There are two types of cracks that first appear, namely longitudinal cracks and transverse cracks. The areas where longitudinal cracks appear are mainly concentrated in the weld seam and heat-affected zone, while the transverse cracks are mainly perpendicular to the direction of the weld seam.

In order to solve the welding crack problem, it is first necessary to find out the cause of the crack. After many experiments on titanium alloy welding with fiber laser welding machine, it is found that some elements will remain in the welding head, and the content of Ti element and Te element in the weld seam is higher than that in the titanium alloy base material, and these two elements are in the laser welding. A large amount of diffusion will occur in the environment and enter the weld. When the fiber laser welding machine is welding, the laser energy generated is very high, and the temperature at the weld is also very high. In a high-temperature environment, Ti and Te elements will form a brittle intermetallic compound, causing the weld to become very brittle. During the welding process, the titanium alloy will expand with the change of temperature. After welding, it will be A certain residual stress will be generated, and the brittle intermetallic compound is prone to cracking when it is impacted by the residual stress, which leads to cracks during welding of titanium alloys.

To solve the problem of cracks in the welding of titanium alloys by fiber laser welding machines, it is necessary to reduce the diffusion of Ti elements and Te elements during welding, thus reducing the generation of brittle metal compounds, and it is also necessary to study which factors will promote Ti in the welding process. Elements and Te elements undergo chemical reactions to reduce the occurrence of such chemical reactions. There is another controllable factor that is relatively easy to improve, which is to reduce the influence of residual stress by prolonging the cooling time of titanium alloy welds, thereby improving the problem of cracks.

Different types of materials have different problems in the welding process. If you find a problem, you must take the initiative to consult. As a manufacturer of fiber laser welding machines, when you receive feedback from customers, you will actively research and upgrade as much as possible in the process of equipment design and production. Perfect, improve the performance of the equipment and reduce the occurrence of problems. Our company’s welding equipment mainly includes industrial fiber laser welding, three-in-one hand-held laser welding machine, small hand-held welding and other laser welding equipment. If you have any problems with laser welding equipment, you can consult our after-sales company. We have rich experience and perfect after-sales service. Technical solutions to ensure the normal work of the equipment!


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