What is overlay welding?

Overlay welding is a surface treatment process that uses heating sources such as arcs to heat metal or alloy materials, and then heats and melts them on the surface of the base materials to fill the other material and form a layer of metal coating. By depositing materials with certain properties on the surface of the workpiece, the surface characteristics of the workpiece can be changed. The purpose of overlay welding is not to connect the workpiece, but to use welding methods to deposit one or several layers of materials with the desired performance on the workpiece. This process method is widely used in various industrial sectors, mainly for repairing worn and cracked parts, or modifying the surface of workpieces to obtain special properties such as wear resistance, heat resistance, and corrosion resistance of the deposited layer. In order to effectively utilize the function of the overlay layer, it is hoped that the overlay welding method adopted will have smaller base material dilution, higher deposition speed, and excellent overlay performance, namely high-quality, efficient, and low dilution rate overlay welding technology.

Application of overlay welding technology to Tube Sheet

The main function of weld overlay tube sheet is to enhance the mechanical properties and wear resistance of the base material. In industries such as chemical plants and power plants, many equipment may experience issues such as wear and corrosion during operation, which seriously affect the stability and lifespan of the equipment. By using the method of overlay welding, the equipment can be reinforced and repaired, greatly extending its service life. weld overlay tube sheets are widely used in petrochemical, coal chemical, refining, oil and gas transportation, marine environment, power, heating and other projects. For more detailed information on welded overlay tube sheet, please click (What is overlay welded tube sheet?)

Application of overlay welding technology on flanges

The flange adopts an overlay welding process to combine the two materials, ensuring that the pipeline transportation medium is corrosion-resistant and meets the pressure requirements under working conditions, while greatly reducing material costs. The base material of flanges is generally carbon steel, alloy steel, pipeline steel, etc; The cladding layer is generally made of corrosion-resistant alloys such as stainless steel, duplex steel, nickel based alloys, titanium materials, copper materials, etc. The weld overlay flanges are suitable for connecting two different materials, but they exhibit excellent corrosion and wear resistance. For example, in fields such as chemical, petroleum, natural gas, and pharmaceuticals, if it is necessary to connect materials with good corrosion resistance and the connection part is required to withstand high temperature and high pressure environments, then overlay welding flanges is a very good choice. Weld overlay clad flanges are suitable for situations with high requirements for connection methods. For example, in equipment such as pipelines and vessels that require sealing, overlay welding flanges have been widely used because they can effectively avoid leakage issues at the connection points.

The advantages of overlay welding flanges

1. Long lifespan: One of the advantages of welded overlay flanges is their good durability, as they can maintain a long service life in harsh environments.

2. Corrosion resistance: Due to the use of materials with good corrosion resistance as welding rods for overlay welding flanges, they can effectively resist the corrosion of strong acidic or alkaline substances.

3. High temperature and high pressure resistance: The welding material of the overlay welding flange can withstand high temperature and high pressure environments, and the connection part will not leak, so it has good applications in extreme temperature or air pressure working environments.

Application of overlay welding technology on pipes and fittings

In the modern industrial field, steel pipes and fittings are widely used in industries such as petroleum, chemical, and power. However, due to long-term use and environmental factors, the inner walls of pipelines often suffer from wear and corrosion, posing a threat to their normal operation. To solve this problem, pipeline inner wall overlay welding technology is usually used.

The benefits of overlay welding on the inner wall of pipes and fittings

1. Superior wear resistance: High performance wear-resistant materials are used for welding, which can effectively resist the wear and corrosion of the inner wall of the pipeline, and extend the service life of the pipe and fitting.

2. Strong corrosion resistance: Special alloy materials are used for overlay welding, which has good corrosion resistance and can effectively prevent corrosion and rust on the inner wall of pipes and fittings.

3. High welding quality: Advanced welding technology is adopted to ensure the bonding strength and density between the overlay layer and the original inner wall of the pipeline, avoiding the risk of leakage caused by welding quality issues.

4. Easy to operate: The inner wall welding technology of pipes and fittings has the characteristic of easy operation, without the need to disassemble the pipes, only local repairs need to be carried out inside the pipes, greatly saving maintenance time and costs.

5. Environmental protection and energy conservation: Compared with the traditional method of replacing pipes, pipeline inner wall welding technology has lower energy consumption and smaller environmental impact, which meets the green and environmental protection requirements of modern industrial production.