CN105714096A - Welded component postwelding heat treatment process - Google Patents

Abstract

The invention discloses a welded component postwelding heat treatment process including the following steps: 1) postwelding heat treatment is required to preferably adopt a method of heating in a furnace, and the heat treatment furnace is required to meet relevant provisions of GB9452; and under a condition of accumulation of the corresponding relationship value of the furnace temperature and heated components, the temperature of the furnace is generally allowed to calculate the temperature of the heated components during furnace internal heat treatment; 2) the heated components are required to be neatly placed in an effective heating area in the furnace, the furnace internal heat is guaranteed to be evenly circulated, and during flame furnace internal heat treatment, flame is required to be avoided from directly spraying onto the workpieces; and 3) for preventing generation of the restraint stress and deformation, a support of the heated components is required to be reasonably placed, and necessary supporting and other tools are required to be additionally added on large thin-wall members and components with great structure and geometry size changes so as to increase the stiffness and balancing stability. The technical problem to be solved comprises that provided is the welded component postwelding heat treatment process; the heat treatment process is simple in method and can make a welding effect better and more stable.

Description

Welded unit post weld heat treatment technique

Technical field

The present invention relates to a kind of welded unit post weld heat treatment technique.

Background technology

Current welded unit post weld heat treatment technics comparing is complicated, also without unified specification, it does not have unified standard, the welded unit quality causing production is uneven, a lot of operations that repeat also make under production efficiency, increase the work burden of workman, make the competitiveness of product in market not high simultaneously.For some operators just entered a profession, it does not have a clear and definite method technique, cause, when operation, mistakes and omissions often occur, in some instances it may even be possible to cause serious consequence.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of welded unit post weld heat treatment technique, and this heat-treatment technology method is simple, it is possible to make welding effect better more firm.

For achieving the above object, the invention provides a kind of welded unit post weld heat treatment technique, it is characterised in that comprise the steps, 1) post weld heat treatment should preferentially adopt the method for heating in stove, and its heat-treatment furnace should meet the pertinent regulations of GB9452.When have accumulated the corresponding relation value of furnace temperature and heated object, in stove during heat treatment, generally allowing the temperature utilizing furnace temperature to calculate heated object, but to special or important welding product, temperature survey should be as the criterion with the thermocouple being placed on heated object；

2) heated object should fitly be placed in the effective heating area in stove, and ensure that furnace heat is uniform, circulate, and flame should be avoided in flame furnace during heat treatment to be directly injected on workpiece；

3) in order to prevent the generation of constraint stress and deformation, should rationally dispose the bearing of heated object, large thin-wall element and structure, geometrical variations great disparity person should be added the frocks such as necessary support to increase rigidity and stability of equilibrium；

4) post weld heat treatment technological parameter: temperature when (1) heated object enters stove or comes out of the stove must not exceed 400 DEG C, but thickness difference is relatively big, that structure is complicated, dimensional stability requirements is higher, residual-stress value requirement is relatively low heated object, in-furnace temperature when it enters stove or comes out of the stove is generally no more than 300 DEG C；

(2), after weldment is warming up to 400 DEG C, thermal treatment zone programming rate must not exceed (5000/ δ s) DEG C/h, and must not exceed 200 DEG C/h, and most I is 50 DEG C/h；

(3), when heating up, in the thermal treatment zone, the temperature difference in any 5000mm length cannot be greater than 120 DEG C；

(4), during insulation, in the thermal treatment zone, the highest difference with minimum temperature is no more than 65 DEG C；

(5) during heating and heat preservation, thermal treatment zone atmosphere should be controlled, it is prevented that weldment excessive surface aoxidizes；

(6) when furnace temperature is higher than 400 DEG C, thermal treatment zone cooling rate must not exceed (6500/ δ s) DEG C/h, and must not exceed 260 DEG C/h, and most I is 50 DEG C/h.

More than 260 DEG C/h, most I is 50 DEG C/h.

The invention has the beneficial effects as follows: the heat-treatment technology method of the present invention is simple, it is possible to make welding effect better more firm.

Detailed description of the invention

Technical scheme disclosed by the invention is a kind of welded unit post weld heat treatment technique, it is characterised in that comprise the steps, 1) post weld heat treatment should preferentially adopt the method for heating in stove, and its heat-treatment furnace should meet the pertinent regulations of GB9452.When have accumulated the corresponding relation value of furnace temperature and heated object, in stove during heat treatment, generally allowing the temperature utilizing furnace temperature to calculate heated object, but to special or important welding product, temperature survey should be as the criterion with the thermocouple being placed on heated object；

2) heated object should fitly be placed in the effective heating area in stove, and ensure that furnace heat is uniform, circulate, and flame should be avoided in flame furnace during heat treatment to be directly injected on workpiece；

3) in order to prevent the generation of constraint stress and deformation, should rationally dispose the bearing of heated object, large thin-wall element and structure, geometrical variations great disparity person should be added the frocks such as necessary support to increase rigidity and stability of equilibrium；

4) post weld heat treatment technological parameter: temperature when (1) heated object enters stove or comes out of the stove must not exceed 400 DEG C, but thickness difference is relatively big, that structure is complicated, dimensional stability requirements is higher, residual-stress value requirement is relatively low heated object, in-furnace temperature when it enters stove or comes out of the stove is generally no more than 300 DEG C；

(2), after weldment is warming up to 400 DEG C, thermal treatment zone programming rate must not exceed (5000/ δ s) DEG C/h, and must not exceed 200 DEG C/h, and most I is 50 DEG C/h；

(3), when heating up, in the thermal treatment zone, the temperature difference in any 5000mm length cannot be greater than 120 DEG C；

(4), during insulation, in the thermal treatment zone, the highest difference with minimum temperature is no more than 65 DEG C；

(5) during heating and heat preservation, thermal treatment zone atmosphere should be controlled, it is prevented that weldment excessive surface aoxidizes；

(6) when furnace temperature is higher than 400 DEG C, thermal treatment zone cooling rate must not exceed (6500/ δ s) DEG C/h, and must not exceed 260 DEG C/h, and most I is 50 DEG C/h.

The heat-treatment technology method of the present invention is simple, it is possible to make welding effect better more firm.

The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (1)

1. a welded unit post weld heat treatment technique, it is characterized in that, comprise the steps, 1) post weld heat treatment should preferentially adopt the method for heating in stove, and its heat-treatment furnace should meet the pertinent regulations of GB9452, when have accumulated the corresponding relation value of furnace temperature and heated object, in stove during heat treatment, generally allow the temperature utilizing furnace temperature to calculate heated object, but to special or important welding product, temperature survey should be as the criterion with the thermocouple being placed on heated object；

2) heated object should fitly be placed in the effective heating area in stove, and ensure that furnace heat is uniform, circulate, and flame should be avoided in flame furnace during heat treatment to be directly injected on workpiece；

3) in order to prevent the generation of constraint stress and deformation, should rationally dispose the bearing of heated object, large thin-wall element and structure, geometrical variations great disparity person should be added the frocks such as necessary support to increase rigidity and stability of equilibrium；

4) post weld heat treatment technological parameter: temperature when (1) heated object enters stove or comes out of the stove must not exceed 400 DEG C, but thickness difference is relatively big, that structure is complicated, dimensional stability requirements is higher, residual-stress value requirement is relatively low heated object, in-furnace temperature when it enters stove or comes out of the stove is generally no more than 300 DEG C；

(2), after weldment is warming up to 400 DEG C, thermal treatment zone programming rate must not exceed (5000/ δ s) DEG C/h, and must not exceed 200 DEG C/h, and most I is 50 DEG C/h；

(3), when heating up, in the thermal treatment zone, the temperature difference in any 5000mm length cannot be greater than 120 DEG C；

(4), during insulation, in the thermal treatment zone, the highest difference with minimum temperature is no more than 65 DEG C；

(5) during heating and heat preservation, thermal treatment zone atmosphere should be controlled, it is prevented that weldment excessive surface aoxidizes；

(6) when furnace temperature is higher than 400 DEG C, thermal treatment zone cooling rate must not exceed (6500/ δ s) DEG C/h, and must not exceed 260 DEG C/h, and most I is 50 DEG C/h.