A welding method and equipment for steel pipes and fins of h-type economizers for boilers

Abstract

A method and equipment for welding steel pipes and fins of H-type economizers for boilers, belonging to the technical field of boiler manufacturing, solving the current problems existing in the welding of steel pipes and fins, and a steel pipe for H-type economizers for boilers A welding method with fins, which includes friction welding multiple fins with steel pipes at the same time; a welding equipment for steel pipes and fins of H-type economizers for boilers, which includes fin fixed molds, hydraulic expansion devices, Motor drive system and supporting device; there are two rib fixed molds, and the two rib fixed molds are symmetrically arranged, and a plurality of grooves for inserting ribs are correspondingly arranged on the inner surfaces of the two rib fixed molds. The outer sides of the rib fixed molds are respectively provided with hydraulic telescopic devices, the outer sides of one end of the two rib fixed molds are provided with a motor drive system, and the outer sides of the other ends of the two rib fixed molds are provided with supporting devices. For welding of H-type economizer.

Description

technical field [0001] The invention belongs to the technical field of boiler manufacturing, and in particular relates to a welding method and equipment for a steel pipe and fins of an H-type economizer for a boiler. Background technique [0002] In the current boiler manufacturing industry, H-type economizers with H-shaped fins welded outside steel pipes are more and more widely used because they can greatly improve heat exchange efficiency; at present, the welding of steel pipes and fins adopts the traditional Circumferential multi-point welding technology has the following disadvantages: [0003] 1. Limited by the traditional welding process, the ribs can only be welded one by one, the welding speed is slow, the production efficiency is very low, and the manufacturing cost increases. [0004] 2. Influenced by the traditional welding process, the distance between two fins is greater than 20mm, which limits the number of fins that can be welded on the steel pipe, reduces t...

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Problems solved by technology

[0003] 1. Limited by the traditional welding process, the ribs can only be welded one by one, the welding speed is slow, the production efficiency is very low, and the manufacturing cost increases

[0004] 2. Affected by the traditional welding process, the distance between two fins is greater than 20mm, which limits the number of fins that can be welded on the steel pipe, reduces the finning ratio, and reduces the heat transfer area

[0005] 3. It only has good heat conduction effect at the solder joints, and the parts other than the solder joints are prone to virtual connections, resulting in increased thermal resistance and reduced overall heat transfer efficiency

[0006] 4. The fusion angle between the fin and the steel pipe is small, only about 140°, which reduces the contact area between the steel pipe and the fin and further reduces the heat transfer efficiency

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