Detailed explanation of the importance of preheating before welding

Large-scale welding processes often have very strict requirements on welding quality, such as the welding of important parts, low carbon, alloy steel and thick parts, because a little carelessness will lead to small losses, and the consequences are also our personal or business. unbearable.
If you want to pass the welding effect, then the preheating process before welding is essential, so why do you need preheating before welding?
The weldment will generate stress and phase transformation structure during welding, and if this stress and phase transformation structure are not eliminated during the welding process, it will cause welding cracks.
The main purpose of preheating before welding is to eliminate welding stress, slow down the cooling rate after welding, remove hydrogen, and avoid hardened structure.
Simply put, it is to prevent cold cracks, but we need to know that the temperature for welding preheating is related to the chemical composition, hydrogen content, welding method, base metal thickness and restraint of the weldment. When setting the preheating temperature, it should be comprehensively considered and treated according to the specific situation.
At present, the pre-welding preheating equipment commonly used in the industry is the Induction Heating Equipment. Since the induction heating device uses the principle of electromagnetic induction to generate high-frequency induction eddy current heating effect, the device for heating the workpiece is safe, efficient and environmentally friendly. It is the best choice for induction heating at present.

If you have questions about induction heating, please consult POLARIS-ETeK to provide you with heat treatment solutions in all aspects.