For high-frequency induction welding of aluminum tubes, it is recommended to use a V-shaped angle of 5°~ that is, a V angle 50.8 mm (2 in) away from the welding point.
The distance between the edges of the plate at the color opening is 5.08~7.62 mm. When the V-shaped angle is small, weld defects will occur due to unstable welding. This defect is caused by a molten half-moon metal strip leading to the weld. The metal band gradually gathers during welding, breaks when its surface tension becomes difficult to maintain, and is extruded by electromagnetic force. A "cold weld" defect occurs when almost all of the molten metal is squeezed out.
Most aluminum pipes require smooth inner walls, but due to the small diameter of welded pipes, the burrs in the weld cannot be removed. In order to reduce the undergrowth of the weld seam
For thorns, generally use a higher welding frequency to reduce the melting amount of the strip as much as possible. In addition, it should also ensure that the position of the edge of the strip after the tube blank is rounded is appropriate, that is, the edge of the strip is in a parallel position after the tube blank is rounded. If the two sides of the strip are inclined, due to the proximity effect, the inner weld of the tube billet will be overheated, and more molten metal will be produced in the inner weld, forming a larger weld bead.
Before welding aluminum tubes, understand its characteristics and techniques in order to improve welding efficiency and ensure welding quality.