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Aluminum Tube Bus
Aluminum tube bus
Tubular conductors are hollow-core conductors, with a small skin effect coefficient, and are conducive to increasing the starting voltage of corona. The outdoor power distribution device uses a tubular conductor, which has the advantages of small footprint, simple structure, and clear layout.
1 Executive standard: YS / T454-2003 aluminum and aluminum alloy conductor
2 Product grade: 3A21 6063 6R05 1060
3 Product status: H18 T10 T6 T6511
4 Physical and mechanical properties at room temperature
5 Common calculation data of aluminum tube bus
6 Aluminum tube bus current carrying capacity (reference ambient temperature + 25 ℃)
7 Deflection calculation data (taking 6063T6 as an example)
8 Installation instructions
Tube-type conductors are generally installed overhead after welding, and are fixed with special pipe bus fittings. Due to the reduced strength at the joints after welding (about 65% of the base metal), in order to avoid bending of the joints during use, Liners are used for reinforcement inside the joint. There should be no more than two welded joints between two overhead pillars (or suspension points). The common welding methods for aluminum and aluminum alloy pipes are as follows:
TIG welding, under the protection of argon gas, uses a DC welding power source, using a welding wire (or electrode) as an electrode to make it arc with the workpiece, and welding with the welding wire (or electrode) and the workpiece interface The advantage is that the heat is concentrated, the arc is stable, the molten metal can be well protected from argon from oxidation, and the oxide film on the surface of the molten metal can be removed by argon arc. Therefore, it can obtain high quality welds with fewer defects and purity. It is easier to master welding technology and can perform all-position welding.
1 requirements for argon
The purity of krypton argon should be controlled above 99.9%, among which the impurity oxygen is below 0.005%, the hydrogen is below 0.005%, the water is below 0.02mg / L, and the nitrogen is below 0.015%. Increased oxygen and nitrogen all worsened the cathode atomization. If the oxygen exceeds 0.3%, the tungsten electrode will be aggravated. If the oxygen exceeds 0.1%, the weld surface will be matte or black. If the nitrogen exceeds 0.05%, the flowability of the molten pool will be deteriorated and the welding surface will be poorly formed.
2 connector form
Graphics and dimensions at the joint
3 Welding requirements
In order to fix the tubular conductor and reduce deformation, the welding sequence should be spot welding first, and the main pipe should be fixed to reduce the bending at the joint. It is advisable to perform spot welding symmetrically. The flow of argon is generally 30 ～ 50L / min.
4 Welding wire (or electrode) composition
5 joint strength factor
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