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Titanium alloy tube welding method - laser welding

In the welding of titanium alloy pipe plant, the welding depth is determined by the thickness of titanium pipe.Thus, the production goal is to improve formability by reducing weld widths, while achieving higher speeds.When choosing the most suitable laser, one must consider not only the beam quality, but also the accuracy of the tube mill.In addition, before the error in the size of the mill can play a role, the limitation of reducing the spot must be considered first.

There are many problems with the dimensions specific to titanium tube welding, however, the main factor that affects welding is the joint on the welding box.Once the titanium plate has been formalized for welding, weld characteristics include: titanium plate clearance, severe/slight weld misalignment, and changes in the weld midline.The gap determines how much material is used to form the weld pool.Too much pressure can lead to excess material at the top or inside diameter of titanium alloy welded tubes.On the other hand, serious or slight welding dislocation can lead to poor welding appearance.

In both cases, the titanium plate is cut and cleaned, rolled up and sent to the weld site.In addition, a coolant is used to cool the induction coil used in the heating process.Finally, some coolant will be used in the extrusion process.Here, a large force is applied to the extruding pulley to avoid porosity in the welding area;However, the use of greater extrusion pressure will result in increased burr (or bead).Therefore, specially designed cutters are used to remove burrs inside and outside the tube.

One of the main advantages of the high-frequency welding process is its ability to process titanium tubes at high speed.However, as is typical in most solid-phase forgings, high-frequency welded joints cannot easily be reliably tested using conventional non-destructive techniques.Welding cracks may occur in thin areas of low strength joints that cannot be detected by conventional methods and may lack reliability in some demanding automotive applications.

Traditionally, titanium tube manufacturers have chosen to complete the tungsten arc welding (GTAW) process.GTAW produces an arc welding between two non-expendable tungsten electrodes.Meanwhile, inert shielding gas is imported from the gun to shield the electrodes, produce ionized plasma streams, and protect the molten pool.This is an established and understood process that will allow the repeated completion of high quality welding processes.Thus, the success of the welding process in titanium alloy pipe plants depends on the integration of all individual technologies, so it must be treated as a complete system.

In all titanium tube welding applications, the edge of the titanium plate is melted, and when the edge of the titanium tube is pressed together using a clamping bracket, the edge solidifies.However, a characteristic property of laser welding is its high energy beam density.The laser beam not only melts the surface of the material, it also creates a keyhole, making the weld appear narrow.When welding titanium alloy tubes, flat titanium plates are formed and then the shape is made into a round tube. Once formed, the joints of the titanium alloy tubes must be welded together.This weld greatly affects the formability of parts.Therefore, it is very important to choose the right welding technology in order to obtain the welding shape that can meet the strict testing requirements in the manufacturing industry.There is no doubt that tungsten arc welding (GTAW), high frequency (HF) welding, and laser welding have been used in the manufacture of titanium alloy tubes.

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