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The Protection of The Transition Joints

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The Protection of The Transition Joints

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2014-06-03 12:00
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(Summary description)Coefficient of thermal expansion of copper and aluminum differ greatly. Than the thermal expansion coefficient of aluminum is about 36% that of copper, in the transition joint heating copper material will be squeezed and not fully recover after cooling. Thus, in the long run Lengrebujun term repeated temperature changes (e.g., power and power, a small load and a large load, alternating hot and cold weather, etc.), the contact surface tends to have a greater impact gap the contact area, resulting in poor contact of the contact resistance increases further.

The Protection of The Transition Joints

(Summary description)Coefficient of thermal expansion of copper and aluminum differ greatly. Than the thermal expansion coefficient of aluminum is about 36% that of copper, in the transition joint heating copper material will be squeezed and not fully recover after cooling. Thus, in the long run Lengrebujun term repeated temperature changes (e.g., power and power, a small load and a large load, alternating hot and cold weather, etc.), the contact surface tends to have a greater impact gap the contact area, resulting in poor contact of the contact resistance increases further.

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2014-06-03 12:00
  • Views:
Information

Coefficient of thermal expansion of copper and aluminum differ greatly. Than the thermal expansion coefficient of aluminum is about 36% that of copper, in the transition joint heating copper material will be squeezed and not fully recover after cooling. Thus, in the long run Lengrebujun term repeated temperature changes (e.g., power and power, a small load and a large load, alternating hot and cold weather, etc.), the contact surface tends to have a greater impact gap the contact area, resulting in poor contact of the contact resistance increases further.

Meanwhile, loosening the connection due to contact a gap into the air, resulting in the formation of aluminum oxide aluminum wire. Although the aluminum oxide layer is thin, but its resistance value is high, the contact resistance increases significantly at a connection, the connecting portion is easy to heat, increased oxidation, and to reduce the strength of the transition joint.

Oxidation of adsorbed water film will be, will lead to weld porosity generated during welding. These defects will reduce the performance of the transition weld joint. In order to ensure the welding quality, clean the surface oxides must be strictly weldment before welding, and to prevent re-oxidation during the soldering process, transition joints in metal to molten metal and high temperature for effective protection, which is aluminum and aluminum alloy welding an important feature.

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