Welding groove heat treatment jet burning system

Abstract

The invention discloses a welding groove heat treatment jet burning system which is easy to operate, low in manufacturing cost, convenient to use and high in practicability. The welding groove heat treatment jet burning system comprises a jet burner and a control system based on STM32. An infrared temperature measuring device is arranged on the upper portion of the jet burner. A fuel gas input port and a combustion-supporting gas inlet are formed in the lower portion of the jet burner. The jet burner comprises a protection outer shell and a fire-jet head outer shell arranged at one end of theprotection outer shell. Three fire jet cavities are formed in the fire-jet head outer shell, namely the temperature increasing fire jet cavity, the temperature constant fire jet cavity and the temperature decreasing fire jet cavity which are arranged in sequence. A spray gun is arranged in each fire jet cavity. A shuttle with the diameter between smaller than that of a nozzle is arranged in each spray gun. A flow control device is arranged at the combustion-supporting gas inlet. Another flow control device is further arranged at the fuel gas input port. The infrared temperature measuring device and the flow control devices are electrically connected with the control system based on STM32. By adopting the jet burner and the control system based on STM32, thermal stress relieving of weldinggrooves can be achieved, and welding defects are eliminated.

Description

technical field [0001] The invention relates to the field of mechanical equipment automation, in particular to a combustion system for heat treatment of welding joints. Background technique [0002] It is well known that the residual stress caused by the uneven heating temperature of the object during processing mainly has the following two reasons: the first is the local thermoplastic deformation caused by the uneven temperature. The second is the local plastic deformation caused by the uneven volume expansion caused by the phase transition. The residual stress caused by component dimensional tolerances is often caused by fit problems. For example, when the hull sections are docked, the butt steel plates must be pulled together. These structures are pulled together by external tension. After the external force is removed, the entire system There is a residual stress. The influence of residual stress plays a negative role in most cases; such as reducing the strength of the...

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Problems solved by technology

The second is the local plastic deformation caused by the uneven volume expansion caused by the phase transition.

[0005] First: The flame of the existing burner is highly concentrated and the temperature is high. In terms of the characteristics of thermal stress relief, simply heating and remelting a certain welding joint cannot achieve the desired effect, and even the components will be affected by the cooling speed. And cause secondary residual stress;

[0006] Second: the limitations are large, some fixed large parts cannot be processed, the time span is large, and the flexibility is low;

[0007] Third: At present, the current situation at home and abroad basically adopts the method of eliminating thermal stress at the interface of pipes or steel plates. The heat treatment machinery and equipment are heavy, the input cost is high, and there are certain defects. It cannot guarantee the integrity and reliability of the welding structure while eliminating thermal stress. performance, safety and usability;

[0008] Fourth: After the parts are assembled, new residual stress will be generated, which is difficult to solve by traditional heat treatment methods

[0009] Fifth: Manual operation requires high experience of workers, and manual adjustment of heating temperature cannot achieve optimal results. At the same time, manual operation errors and personal safety are also important considerations

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