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The elimination of aluminum profile surface welding stripes
DATE:2012-08-21 DATE:

Aluminum extrusion profiles in corrosion treatment or anodized surface appear overtly or covertly, and parallel to the extrusion direction of the white-lined, lined generally known as the stripes of the welding. Different from poor welding, welding stripe does not reduce the mechanical properties of the profiles, but the place of welding stripes and other parts of the surface profile to form a larger component, seriously affecting the appearance of the decorative surface, it is difficult to be accepted by users. Therefore, how to eliminate the aluminum surface welding stripes are the key issues we need to study.

Cause analysis and solutions

Aluminum extrusions is aluminum alloy rod through the extrusion die hot extrusion production. Most of the welding stripes appear hollow profiles, welding, and then in the mold room a few shares of aluminum alloy flow solder extrusion pressure in extrusion process of aluminum alloy round ingot the shunt mold divided into shares of aluminum alloy flow together out of the die hole formed hollow sections. In this process, the welding pressure-flow state of aluminum alloy, extrusion temperature and extrusion speed and other factors all affect the generation of welding stripes. The following are several factors affecting welding stripes were introduced to the solution.

2.1 welding chamber depth

Aluminum alloy round ingot mold shunt hole is divided into a number of shares of aluminum alloy flow out of the die hole, and Area B in the A region of the welding chamber welding incorporated. If H ≤ A, the aluminum alloy flow has not been fully welding has reached the mold hole forming surface profile will form the stripes of the welding. Therefore, we should make in the design of the welding chamber height H ≥ A, set aside a certain height as Area B, the aluminum alloy flow in fully welded together and then out of the die hole. For H ≤ A mold in the mold amendment, we can use the bridge Shen will go to Area C, the shunt bridge milling, so that the final welding chamber height H> A and is intended to keep the aluminum alloy flow in fully welded together after the outflow of the die hole.

2.2 shunt bridge shape

6063 aluminum alloy commonly used in the architectural aluminum extrusions, the free flow of maximum extension angle approximately 45 °, limited only by the state of the squeeze pressure along the perpendicular to the extrusion direction to deflect the flow of the maximum angle of approximately 45 °, and the expansion along the angle the greater the smaller the expansion of the angular direction of pressure, shown in Figure 2. Without considering the friction welding of aluminum alloy flow pressure after shunt bridge along the direction of shunt bridge aluminum alloy flow in the shunt bridge, the welding pressure is proportional to its pressure flow along the shunt bridge shunt the sharp angle of the Bridge α is smaller, the greater the pressure of the welding of aluminum alloy flow in the shunt bridge.