The Principle and Operating Process of Equal-Diameter Welded Titanium Tee Fittings

I. Principle of the Automatic Welding Machine for Equal-Diameter Welded Titanium Y-Piece:
The titanium three-way fitting is formed by welding the main pipe and the branch pipe. A hole equal to the inner diameter of the branch pipe is opened on the main pipe. A saddle-shaped groove is cut on the end of the branch pipe to be connected with the main pipe by using a saddle-shaped gas cutting machine. The welding is carried out by using flux-cored wire CO2 gas shielded welding. The welding torch remains in a fixed relative position but only swings in angle. Firstly, the branch pipe and the main pipe of the three-way fitting are spot-welded together. The three-way fitting is fixed by using a chuck and a drag chuck. By adjusting the adjustment device, the three-way fitting can perform both circular and linear movements simultaneously, tracing a saddle-shaped curve. The welding groove is then filled by the welding torch.

II. Operating Process of Equal-Diameter Welded Tees:
1. Welding position:
When the welding torch is at the shoulder, it forms a 45° angle with the cylinder of the header. As the position changes, the angle between the welding torch and the surface of the weld seam varies between 70° and 90°.

2. Welding operation techniques:
According to the characteristics of the equal diameter welded titanium tee, the shoulder groove is small, with less filler metal, while the belly groove is large, with more filler metal. To ensure that the amount of weld metal filled in each layer of the groove is uniform and keep the thickness of the shoulder and belly welds consistent, during the welding process, it is necessary to appropriately increase the number of weld layers or the swing amplitude of the belly weld. During the welding process, the length of the repeated weld beads can be adjusted at any time according to the condition of the belly weld. Additionally, attention should be paid to the smooth transition between the weld beads (layers) on the outer edge of the groove to maintain the outer edge shape of the welded titanium tee.

The cover plate welding is divided into two layers. The first layer is used for local repair welding of the saddle-shaped groove welds, making the welds uniform, round and consistent, laying the foundation for the cover welding; the second layer is welded to the formed cover. During welding, the welding wire should be horizontally oscillated, always keeping the weld bead parallel to the horizontal plane to prevent the formation of weld beads. As the welding process progresses, the angle between the weld bead and the centerline of the pipe joint constantly changes. When welding to the lower point of the abdomen (where the two welds meet on both sides), a triangular unfilled weld area is formed. When welding the triangular unfilled weld area, the oscillation range of the welding torch should not be too large, and the arc should not exceed the weld bead to maintain the uniformity of the joint and a beautiful shape.

The above-mentioned welding process is simple in design and manufacture, convenient for maintenance, easy and flexible to operate, does not require tooling and molds, has a shorter manufacturing cycle, occupies a smaller area, is low in cost, and can meet the manufacturing requirements of titanium equal diameter welding tees, solving the problem of low efficiency in manual welding.