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Welding technology of membrane water wall
Circulating fluidized bed boiler is a new power plant boiler, which is widely used in medium and small power stations instead of pulverized coal boiler. The utility model has the advantages of energy saving, less pollution, low cost and can burn many kinds of coal, especially the inferior coal. However, because the water wall adopts membrane water wall, there are many difficulties in the assembly of row pipes on the ground. The welding process of membrane water wall of yg75 / 3.82-M1 boiler is discussed as follows.

Product Application

Welding of water wall

Machine name:

Product Description:

welding technology
1. Welding method
Manual TIG welding is used for backing and manual arc welding for covering. The material of the pipe is 20g and the specification is ф 60 * 5mm, and the pipe spacing is 20mm. Tig-j50 is used as welding wire and J422 as welding rod ф The purity of argon is not less than 99.95%. The welding machine is gs-400ss silicon rectifier welding machine

Features of CNC surfacing machine tools:

Product Description

welding technology
1. Welding method
Manual TIG welding is used for backing and manual arc welding for covering. The material of the pipe is 20g and the specification is ф 60 * 5mm, and the pipe spacing is 20mm. Tig-j50 is used as welding wire and J422 as welding rod ф The purity of argon is not less than 99.95%. Gs-400ss silicon rectifier welding machine is used.
2. Welding preparation
1) Remove the oil, rust, paint and oxide scale, grind the metal luster within 10-15mm inside and outside the groove, and the unilateral groove is 30-35 degrees.
2) Reliable windproof measures must be taken at the site of argon arc welding. At the same time, both ends of the pipe shall be blocked with pipe plug to prevent ventilation and affect the argon protection effect.
3) According to the drawing proposal, the weld clearance is 1 mm. Considering the actual effect, the gap is 2-3 mm, and the lower part can be larger, and the upper part can be smaller. The location of positioning welding is one point at the top and the bottom, and the length is 20 mm.
3. Welding parameters
Main welding parameters: welding wire diameter ф 5 mm, welding current 75-85a, arc voltage 20-24 V, gas flow 6-8 L / min, DC power supply, electrode connected to positive electrode, ce-20 tungsten electrode, nozzle diameter of 10 mm, tungsten electrode extension length of 6-8 mm. Electrode diameter ф 2.5mm, current 75-85a.
Shanghai duomu Industrial Co., Ltd. is a high-tech industry specializing in power development. The welding power supply is my key project. The series welding machines developed have reached or exceeded the international advanced level. They are recognized by customers and have a wide range of customer groups and popularity. The products are mainly used in welding of precision parts, thin plates, etc., surfacing welding of valves, rolls, pick, etc., and welding repair of moulds and mechanical shafts, etc. it has been widely used in many fields such as electronic appliances, coal mining machinery, aerospace, etc.

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