Rail Aluminum Heat Welding

Aluminum heat welding method is currently the main method of seamless line welding joints at home and abroad, with simple equipment, easy to operate, suitable for welding on the line and other advantages.

The composition of aluminum heat flux can be divided into three parts：

Aluminum heat flux and sand

Pre-preparation Before carrying out aluminum heat welding of rails, a series of preparatory work is required:

1.1 Clean the welding area. Because the welding area needs to be clean, dry and free of oil, water vapor and other substances, so the welding area needs to be cleaned before welding.

1.2 Determine the welding position. Determine the position of welding, including the welded rail surface, welding angle, etc., need to follow the relevant standards and norms.

1.3 Do protective measures. Protective measures need to be set up along the rail so as not to affect the quality and effect of aluminum heat welding due to iron filings and cement slag and other substances entering the aluminum welding area.

1.4 Check the equipment. Check whether the heat welding equipment meets the requirements, and ensure that the equipment operates normally.

Second, heat welding process aluminum heat welding is a heat treatment technology, mainly using friction heat source welding method and electron beam welding method. The process flow is as follows:
2.1 Appearance inspection. The appearance of aluminum welding materials to check to ensure that the quality of the material meets the standard requirements.
2.2 Preheating. The rail aluminum heat welding process requires preheating of the welding area, which is usually carried out at about 200°C.
2.3 Heat welding. After the preheating is completed, hot welding is carried out, that is, the aluminum alloy material joints are fused with the rail iron material. The actual welding needs to pay attention to various technical details to ensure the welding quality.
2.4 Rail surface shaping. After the completion of hot welding, the rail surface needs to be shaped to ensure that the whole welding part becomes flat. Third, the thermal disposition and protection of aluminum heat welding after the thermal disposition and protection is very important. In the heat disposal should be carried out according to the actual situation:
3.1 Heat treatment. The aluminum alloy material after welding, annealing or quenching, in order to enhance the corrosion resistance and strength of aluminum welding material.
3.2 Protection. Protect the welding area to avoid factors such as pollution and oxidation to affect the quality of the weld and its surrounding. Fourth, the advantages and disadvantages of aluminum thermal welding The advantages of aluminum thermal welding mainly include fast welding speed, convenient operation, strong weld seam, high safety, environmental protection and other aspects. But its shortcomings should not be ignored, such as the need for preheating, heat disposal and protection procedures, higher costs, not applicable to some special circumstances of welding, such as welding in a low-temperature environment.

Advantages ：

The advantages of aluminum thermal welding mainly include fast welding speed, easy operation, strong welding seam, high safety and environmental protection. But its shortcomings should not be ignored, such as the need for preheating, heat disposal and protection procedures, higher costs, not applicable to some special circumstances of welding, such as welding in a low-temperature environment.

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