Process for welding swing check valve and matching pipe
A check valve and swing-type technology, which is applied in the welding process of swing check valve and piping, can solve the problems of difficulty, no cracks, and affecting the safe operation of pipelines, so as to improve welding quality and reduce repairs The effect of reducing production and operating costs
Inactive Publication Date: 2013-01-16
NANTONG STATE ELECTRIC POWER VALVE
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Problems solved by technology
It is very difficult to weld two parts of different materials together, and the weld seam must not have defects such as cracks and leakage
With regard to the No. 25 high-quality carbon structural steel used in the swing check valve body of the present invention and the Wb36 alloy pipe used in the piping, in the current prior art, these two parts of different materials are welded, which is easy to produce the above-mentioned Enumerated quality problems, which will affect the normal and safe operation of the pipeline
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[0023] The substantive content of the present invention will be described in further detail below in conjunction with accompanying drawing and embodiment:
[0024] As shown in the attached figure: a welding process of swing check valve and piping, the welding process is carried out according to the following steps:
[0025] Step 1: Confirm that the material of valve body 1 is No. 25 high-quality carbon structural steel;
[0026] Step 2: Confirm that the material of the piping 2 matched with the valve body 1 is WB36 alloy pipe;
[0027] Step 3: Select welding rods of type A102 and J607RH, the diameter of the welding rod is Φ5mm;
[0028] Step 4: Use a heating belt to preheat the workpiece, and the preheating temperature is 160°C~180°C;
[0029] Step 5: Baking the electrode, the baking condition is 350℃×1h;
[0030] Step 5: Set the welding current to 180 ~ 200A;
[0031] Step 6: Connect the valve body 1 and the piping 2 by spot welding 3;
[0032] Step 7: Use A102 welding r...
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Abstract
The invention discloses a process for welding a swing check valve and a matching pipe in the field of metal machining processes. The process comprises the following steps of: determining that a valve body is 25# high-quality carbon structural steel, the matching pipe is a WB36 alloy pipe, the type numbers of welding strips are A102 and J607RH, and the diameters of the welding strips are 5 mm; preheating a workpiece by adopting a heating band; baking the welding strips; performing spot-welding connection, backing welding and cover surface welding on the valve body and the matching piece, and then performing thermal treatment; and performing radiographic inspection on a welded part. The process has such advantages that the welding quality of the swing check valve and the matching pipe is effectively improved, the safety of pipeline running is improved, and the production operating cost is reduced.
Description
technical field [0001] The invention relates to a metal processing technology, more specifically, the invention relates to a welding technology of a swing check valve and piping. Background technique [0002] The valve is a kind of pipeline control equipment commonly used in the industrial field. In practical applications, the valve must be combined with the pipeline. Valves and pipes are generally connected by flange and welding. Here we mainly discuss the welding connection. There are many types of valves, and of course there are many materials involved, and the piping needs to be made of different materials according to the needs of actual applications. It is very difficult to weld parts of two different materials together, and the weld seam must not have defects such as cracks and leakage. With regard to the No. 25 high-quality carbon structural steel used in the swing check valve body of the present invention and the Wb36 alloy pipe used in the piping, in the current...
Claims
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IPC IPC(8): B23K31/02
Inventor 徐永明胡永祥赵怀忠郭玉林朱祥
Owner NANTONG STATE ELECTRIC POWER VALVE