Preheating
About Preheating
Preheating is an important heat treatment practice carried out before welding. The base material is heated to a required temperature before the welding operation begins.
By controlling the temperature of the material before welding, the cooling rate can be reduced and the risk of hydrogen cracking can be minimized. Preheating also helps support better weld quality and control during the welding process.
Preheating is particularly relevant when working with thick materials, alloy steels and low-temperature environments.
How Preheating Works
Applications
- Thick Materials : Preheating can be applied when welding thick material sections.
- Alloy Steels : Used as part of welding preparation for alloy steel applications.
- Low-Temperature Environments : Helps control thermal conditions during welding in low-temperature environments.
Key Advantages
Why Preheating Matters
Reduces Cooling Rate
Helps control the rate at which the material cools after welding.
Helps Prevent Cracking
Supports the reduction of hydrogen cracking risk.
Reduces Residual Stress
Helps reduce residual stresses associated with the welding process.
Preheating at LOHITHA Services
Controlled Heating for Better Weld Quality
LOHITHA Services provides heat treatment capabilities including Preheating, Post Heating and PWHT for industrial applications.
Our focus is on controlled execution with attention to quality, safety, accuracy and timely service.
Recent Services
- Inspection & Consultancy
- Thickness Gauging
- Boroscopy Inspection
- Hardness Testing
- Positive Material Identification
- RT – Radiography Testing
- PWHT – Post Weld Heat Treatment
- Post Heating
- DPT – Dye Penetrant Testing
- Vacuum Box Testing
- MPT – Magnetic Particle Testing
- UT – Ultrasonic Testing
- PAUT – Phased Array Ultrasonic Testing
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