Discover how our advanced burner technology can speed up your cycle times by up to 20%
Postweld Heat Treatment with LINDOFLAMM Burners
Accelerate Postheating Cycle Times by up to 20%
Especially when working with higher-strength steels, postheating with a LINDOFLAMM® gas burner has the potential to maintain material integrity after welding while speeding up your job time.
What is Postweld Heat Treatment?
Commonly referred to as stress relief or just postheating, postweld heat treatment (PWHT) is a flame heating process carried out to maintain a metal’s strength and quality by reducing the possibility of later distortion. It is carried out directly after welding, sometimes before machining. In fact, if a welding task calls for workpiece preheating, it often also requires postheating.
In a controlled environment, a selected area of the weld is rapidly heated by a high temperature flame - often with a gas torch - to release diffusible hydrogen. The temperature range depends on the material’s composition, thickness and prior thermal or mechanical steps. With postweld heat treatment of carbon steels, for instance, the workpiece is typically heated to a temperature between 550°C and 600°C. The component is maintained at that temperature for a period before being allowed to cool very slowly. This controlled cooling process prevents further stresses – such as cold cracking – from building up. To reduce the rate of cooling, the fabrication may be surrounded by firebricks, covered by an insulating blanket, or exposed to a gradual reduction in the flame heating temperature.
Materials Suited to Postheating Include:
- Mild carbon steels
- High-strength steels
Getting your Postheating Setup Right - With LINDOFLAMM
Postheating can be a complex step, requiring careful selection of all process parameters. The wrong gas, equipment or setup can waste valuable time and money. It is therefore important to have an experienced and reliable partner at your side - a partner who can provide a comprehensive range of products, best-in-class technology and in-depth process expertise.
Designed Especially for Postheating
The LINDOFLAMM special burners were developed specifically to overcome these challenges. Our portfolio extends from manual to fully automated postheating systems, all custom-adapted to meet both your cost and performance needs. Designed for ease of automation, our LINDOFLAMM special burners offer the most cost-efficient solutions coupled with the highest safety standards. Our end-to-end offering extends from acetylene supply solutions and special LINDOFLAMM burners to electronic components and supporting services - covering everything from design to implementation.
LINDOFLAMM for Postheating: Benefits at a Glance:
- Ease of use
- High-quality welding of high-strength steel
- Reduced risk of hydrogen embrittlement
- Protection of material integrity after welding
- Reduced rework and re-conditioning of products
- Most effective with acetylene as fuel gas: postheating time reduced by up to 20%
- Additional benefits of acetylene, including lowest water vapor content of all fuel gases • Burner selection adapted to your needs
- Customized gas supply solutions
Accelerate Heating Time by up to 20%!
Acetylene has proven to be the ideal fuel gas for postheating projects. The characteristics of the flame allow very rapid and accurate heating, which can save up to 20% of the heating time. Our LINDOFLAMM special burner portfolio is designed to leverage the compelling advantages of acetylene as the fuel gas.
End-to-end Offering from the Flame Treatment Expert
If you work with materials that require preheating and/or postheating, we can provide you with a solution that perfectly suits your individual specifications. Furthermore, you can benefit from our wide range of services that will support you every step of the way – from design to implementation of anything from a manual to a fully automated system.