Rope heater welding thick heat treatment purpose

Rope heater welding thick heat treatment purpose

Welding residual stress is caused by the uneven temperature distribution of the weldment during the welding process, and many abnormal conditions such as thermal expansion and contraction of the weld metal of the rope heater, so the residual stress is generated with the welding construction. stress.
Elimination of residual stress is usually carried out by high temperature tempering, that is, the weldment is placed in a heat treatment furnace and heated to a certain temperature range (below Ac1), and kept for a period of time, using the material at high temperature The lowering of the lower yield limit causes plastic flow to occur in the high internal stress position, and the elastic deformation gradually decreases. The plastic deformation gradually increases and the stress decreases.
For the heat treatment process after welding, the influence on the tensile strength and creep limit of the metal is directly related to the heat treatment temperature and holding time.

Effect of post-weld heat treatment on the impact toughness of rope heaters

1) Welding the rope heater is mainly to reduce the welding residual stress.
2) Stabilize the shape and size of the structure and reduce the occurrence of distortion.
3) Improve the performance of base metal and welded joints, including

Electric heating is the process of converting electric energy into heat energy. The principle of fluid thermodynamics is used to evenly remove the huge heat generated by the electric heating element. However, some faults will occur during the use of the electric heater. When the fault alarm relay is activated, the fault will alarm The light will be on and there will be an audible alarm. If it is an overheating alarm by the overheating temperature controller, you should stop using the electric heater and wait for the temperature to drop before using it, and further check the related equipment. If it is an internal fault alarm of the voltage regulating module, it is usually caused by the burning of electronic components, and it should be replaced as soon as possible with spare parts of the same type of voltage regulating module to ensure production needs. If the media temperature measuring device fails and alarms, check and replace the on-site temperature probe.

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