Welding Methods for Tube Sheets

In large thermal fluid exchange installations, tube bundles are the necessary exchange path. Small diameter volumes of thermal heat exchange devices can be welded by hand using argon arc welding, but large equipment is welded in which each tube plate bundle is in the thousands or more. Such a large volume relying on manual welding is prone to leakage and low welding efficiency. So, how should the tube plate be welded?

Clear the surface of the tube plate and the heat exchanger tube ends within 100mm of the oxide film, rust, oil, water and other dirt. Low alloy steel and carbon steel are generally used with wire brushes, stainless steel should be cleaned with stainless steel wire brushes, then wipe the bevel with acetone to remove oil. After cleaning the welded parts should be assembled and welded as soon as possible, the parking time should not exceed 24 hours.

Check the quality and size of the heat exchanger tube assembly, the length of the tube head should be evenly exposed, there should be no unevenness, and avoid forcing the assembly to reveal the tube head. The tungsten electrode is generally a cerium tungsten electrode. Filler wire must be cleared of oil and rust before welding, and should be stored properly after cleaning, placed in a dry place, and taken as needed. The cleaned wire should not be left for longer than necessary, otherwise it should be cleaned again.

Welding should be carried out indoors in a clean, wind-free area, and outdoors with a windbreak. Welding should not be carried out without effective protection in the following cases Position welding should be carried out with the same grade of wire and using the same welding process as the official welding of the product. When welding, the working interface must be displayed and the programme must be set up first if it has not been pre-programmed. Adjust the head to the required position and use the appropriate tools to adjust the tungsten electrode and wire guide nozzle position.

Hunan Jetvision Industrial Co.,Ltd specialises in the production and sale of heat exchange products, the main products are tube plates, finned tubes, U-shaped tubes, folded plates, flanges, etc. The company has a complete and scientific quality management system. Our integrity, strength and product quality are widely recognized in the industry.