Construction method for controlling content of ferrite in welding seam of discharge valve of reduction tank for titanium sponge

Abstract

The invention discloses a construction method, particularly discloses a construction method for controlling the content of ferrite in a welding seam of a discharge valve of a reduction tank for titanium sponge, and belongs to the technical field of repair and maintenance processes of metallurgical production equipment. The construction method for controlling the ferrite content in the welding seam of the discharge valve of the reduction tank for the sponge titanium can effectively reduce the ferrite content in the welding seam. According to the construction method, in the weld joint welding process, welding heat at a weld joint is indirectly absorbed through a heat dissipation liquid medium, the content of ferrite in the weld joint is controlled within 0.58%, and the heat dissipation temperature of the heat dissipation liquid medium is controlled within 40 + / -5 DEG C.

Description

Technical Field

[0001] The invention relates to a construction method, in particular to a construction method for controlling the ferrite content in a weld of a discharge valve of a reduction tank for sponge titanium, and belongs to the technical field of repair and maintenance process of metallurgical production equipment. Background Art

[0002] The existing discharge valve made of high-temperature resistant stainless steel is welded in the air during assembly and welding. The weld is burned at high temperature and some iron elements are precipitated and gathered around the weld. During the vacuum process of sponge titanium distillation and smelting, it enters the sponge titanium product and causes pollution. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a construction method for controlling the ferrite content in the weld of a discharge valve of a reduction tank for sponge titanium, which can effectively reduce the ferrite content in the weld.

[0004] The technical solution adopted to solve the above technical problems is: a construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium, wherein the construction method indirectly absorbs the welding heat at the weld by the heat dissipation liquid medium during the welding process of the weld to control the ferrite content in the weld within 0.58%.

[0005] The heat dissipation temperature of the heat dissipation liquid medium is controlled within 40±5°C.

[0006] Furthermore, the heat dissipation liquid medium is heat dissipation low-temperature water. During the welding process, the welding heat at the weld is indirectly dissipated by immersing half of the thickness of the discharge valve end face flange into the heat dissipation low-temperature water with the cooperation of the heat dissipation low-temperature water.

[0007] The preferred method of the above scheme is that, according to the DOE quadratic model, the welding parameters are controlled according to the following requirements:

[0008] The welding current was set within the range of 125±15A, the welding voltage was set between 22±1V, and the welding speed was stabilized at 5±0.3mm / s.

[0009] Furthermore, the heat dissipation liquid medium is a flowing heat dissipation liquid medium, a support structure is arranged in the flowing heat dissipation liquid medium, and the end face flange of the discharge valve is horizontally supported in the support structure during welding.

[0010] A preferred embodiment of the above scheme is that the supporting structure is a load-bearing grid arranged in the flowing heat dissipation liquid medium, and the arrangement position of the load-bearing grid is limited to half the thickness of the end face flange of the discharge valve arranged through the load-bearing grid being immersed in the heat dissipation liquid medium.

[0011] Furthermore, a liquid medium temporary storage box is provided outside the load-bearing grid, and the load-bearing grid is arranged in the flowing heat dissipating liquid medium through the liquid medium temporary storage box.

[0012] A preferred embodiment of the above solution is that the flowing heat dissipating liquid medium in the liquid medium temporary storage box is kept in a dynamic temporary storage state with the cooperation of the liquid medium delivery and discharge assembly.

[0013] Furthermore, the liquid medium temporary storage box is composed of a steel plate welded box, and the liquid medium delivery and discharge assembly includes a liquid input pipe and a liquid output pipe. The liquid input pipe is arranged on the side wall of the upper part of the steel plate welded box, and the liquid output pipe is arranged on the side wall of the lower part of the steel plate welded box.

[0014] The beneficial effects of the present invention are as follows: the technical solution provided by the present application is to control the ferrite content in the weld within 0.58% by indirectly absorbing the welding heat at the weld through a heat dissipation liquid medium during the welding process of the weld, and especially to control the heat dissipation temperature of the heat dissipation liquid medium within 40±5°C. In this way, by immediately discharging the heat generated during the welding process from the weld and keeping the weld in a relatively low temperature range, the amount of high-temperature burn of the weld can be minimized, thereby minimizing the precipitation of ferrite in the weld, and ultimately achieving the purpose of controlling the ferrite content in the weld. Furthermore, the heat dissipation of the present application is achieved by indirectly absorbing the welding heat at the weld through a heat dissipation liquid medium, which can also effectively ensure the quality of the weld and avoid the possibility of cracks in the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium of the present invention involves a front view of the arrangement of the discharge valve in the support structure;

[0016] Figure 2 for Figure 1 Top view of the .

[0017] The markings in the figure are: load-bearing grid 1, discharge valve 2, liquid medium temporary storage box 3, liquid input pipe 4, and liquid output pipe 5. DETAILED DESCRIPTION

[0018] like Figure 1 , Figure 2 The present invention provides a construction method for controlling the ferrite content in the weld of a sponge titanium reduction tank discharge valve, which can effectively reduce the ferrite content in the weld. The construction method controls the ferrite content in the weld to within 0.58% by indirectly absorbing the welding heat at the weld by a heat dissipation liquid medium during the welding process.

[0019] Among them, the heat dissipation temperature of the heat dissipation liquid medium is controlled within 40±5°C. The technical solution provided by the present application is to control the ferrite content in the weld within 0.58% by indirectly absorbing the welding heat at the weld through the heat dissipation liquid medium during the welding process of the weld, especially to control the heat dissipation temperature of the heat dissipation liquid medium within 40±5°C. In this way, by immediately discharging the heat generated in the welding process from the weld and keeping the weld in a lower temperature range at all times, the amount of high-temperature burning of the weld can be minimized, thereby minimizing the precipitation of ferrite in the weld, and ultimately achieving the purpose of controlling the ferrite content in the weld. Furthermore, the heat dissipation of the present application is achieved by indirectly absorbing the welding heat at the weld through the heat dissipation liquid medium, which can also effectively ensure the quality of the weld and avoid the possibility of cracks in the weld.

[0020] Combined with the actual production situation of welding production, in order to ensure the convenience of operation and the best possible heat dissipation effect while ensuring the welding quality of the weld, the heat dissipation liquid medium of the present application is heat dissipation low-temperature water. During the welding process, the welding heat at the weld is indirectly dissipated by immersing half of the thickness of the end face flange of the discharge valve into the heat dissipation low-temperature water with the cooperation of the heat dissipation low-temperature water. Correspondingly, according to the DOE secondary model, the welding parameters are controlled according to the following requirements, the welding current is set within the range of 125±15A, the welding voltage is set between 22±1V, and the welding speed is stabilized at 5±0.3mm / s. In order to facilitate the end face flange of the discharge valve to just immerse in the heat dissipation liquid medium, and at the same time not to make the weld contact with the heat dissipation liquid medium, and at the same time, the heat can be taken away at any time, the heat dissipation liquid medium of the present application is a flowing heat dissipation liquid medium, and a support structure is provided in the flowing heat dissipation liquid medium. During the welding process, the end face flange of the discharge valve is horizontally supported in the support structure.

[0021] At this time, a more specific structure is that the supporting structure is a load-bearing grid 1 arranged in the flowing heat dissipation liquid medium, and the arrangement position of the load-bearing grid 1 is limited to half the thickness of the end face flange of the discharge valve 2 arranged through the load-bearing grid 1 is immersed in the heat dissipation liquid medium. A preferred way is that a liquid medium temporary storage box 3 is also provided outside the load-bearing grid 1, and the load-bearing grid 1 is arranged in the flowing heat dissipation liquid medium through the liquid medium temporary storage box 3. For the convenience of control, the flowing heat dissipation liquid medium located in the liquid medium temporary storage box 3 of the present application maintains a dynamic temporary storage state with the cooperation of the liquid medium delivery and discharge assembly. The specific structure is that the liquid medium temporary storage box described in the present application is composed of a steel plate welded box, and the liquid medium delivery and discharge assembly includes a liquid input pipe 4 and a liquid output pipe 5, the liquid input pipe 4 is arranged on the side wall of the upper middle part of the steel plate welded box, and the liquid output pipe 5 is arranged on the side wall of the lower middle part of the steel plate welded box.

[0022] The technical solution of the present application is further described below through specific embodiments:

[0023] Embodiment 1

[0024] The purpose of this application is to provide a method for controlling the ferrite content of high-temperature resistant stainless steel welds, so as to reduce the high-temperature burning of the discharge valve (made of high-temperature resistant stainless steel) during assembly and welding, and to collect part of the iron elements around the weld, which enters the product during the vacuum process of sponge titanium distillation and smelting, thereby reducing the unqualified rate of sponge titanium.

[0025] A water-cooled welding heat sink was studied. The water-cooled welding heat sink consists of a box, a drainage pipe, and a support frame. When in use, the discharge device to be welded is spot welded first and then placed on the heat sink support frame. The water level is 1 / 2 of the end thickness of the discharge device. Then welding is performed. During welding, the welding heat is transferred to the flange through the weld, and the flange is then transferred to the water for heat dissipation. According to the optimal value of the DOE quadratic model, each maintenance parameter is controlled at a welding current of 125±15A, a welding voltage of 22±1V, a heat dissipation water temperature of 40±5℃, and a stable welding speed of 5mm / s. This method effectively reduces the accumulation of part of the iron elements precipitated by high-temperature burning during assembly welding around the weld, and can control the ferrite content of the cobalt-based high-temperature stainless steel weld to within 0.58%. Cobalt-based high-temperature stainless steel welded with a heat sink.

Claims

1. A construction method for controlling the ferrite content in the weld of a discharge valve of a reduction tank for sponge titanium, characterized in that: The construction method controls the ferrite content in the weld to within 0.58% by indirectly absorbing the welding heat at the weld through the heat dissipation liquid medium during the welding process. The heat dissipation temperature of the heat dissipation liquid medium is controlled within 40±5°C.

2. The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium according to claim 1 is characterized in that: The heat dissipation liquid medium is heat dissipation low-temperature water. During the welding process, the welding heat at the weld is indirectly dissipated by immersing half of the thickness of the discharge valve end flange into the heat dissipation low-temperature water with the cooperation of the heat dissipation low-temperature water.

3. The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium according to claim 1 or 2, characterized in that: According to the DOE quadratic model, the welding parameters are controlled as follows: The welding current was set within the range of 125±15A, the welding voltage was set between 22±1V, and the welding speed was stabilized at 5±0.3mm / s.

4. The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium according to claim 1 or 2, characterized in that: The heat dissipation liquid medium is a flowing heat dissipation liquid medium, a support structure is arranged in the flowing heat dissipation liquid medium, and the end face flange of the discharge valve is horizontally supported in the support structure during welding.

5. The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium according to claim 4 is characterized in that: The supporting structure is a load-bearing grid (1) arranged in a flowing heat dissipating liquid medium. The arrangement position of the load-bearing grid (1) is limited to half the thickness of the end face flange of the discharge valve (2) arranged through the load-bearing grid (1) being immersed in the heat dissipating liquid medium.

6. The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium according to claim 5, characterized in that: A liquid medium temporary storage box (3) is also provided outside the load-bearing grid (1), and the load-bearing grid (1) is arranged in the flowing heat-dissipating liquid medium through the liquid medium temporary storage box (3).

7. The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium according to claim 6, characterized in that: The flowing heat dissipating liquid medium in the liquid medium temporary storage box (3) is kept in a dynamic temporary storage state with the cooperation of the liquid medium delivery and discharge components.

8. The construction method for controlling the ferrite content in the weld of the discharge valve of the reduction tank for sponge titanium according to claim 7, characterized in that: The liquid medium temporary storage box is composed of a steel plate welded box. The liquid medium delivery and discharge assembly includes a liquid input pipe (4) and a liquid output pipe (5). The liquid input pipe (4) is arranged on the side wall of the upper part of the steel plate welded box, and the liquid output pipe (5) is arranged on the side wall of the lower part of the steel plate welded box.

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