Guide pipe welding blowing device and method

Abstract

The invention provides a guide pipe welding blowing device and method. The guide pipe welding blowing device comprises a four-way joint, a gas cylinder, a pressure reducing valve, a flow meter, a pressure gauge, a first guide pipe, a second guide pipe, a first long-handle ball valve, a second long-handle ball valve and a third long-handle ball valve 10. A first port of the four-way joint is connected with the flow meter through a first guide pipe; the flowmeter is connected with the gas cylinder through a pressure reducing valve; a second port of the four-way joint is connected with the to-be-welded part through a second guide pipe; a first port of the four-way joint is connected with a first long-handle ball valve, a fourth port of the four-way joint is connected with a second long-handle ball valve, and a third port of the four-way joint is connected with a third long-handle ball valve; and a third port of the four-way joint 1 is directly connected with the pressure gauge 5. Multi-runner guide pipe assembly welding can be achieved, the air pressure of the welded inner wall is monitored in real time, the welding stability is good, the product welding quality and the production and development efficiency can be improved, and the production cost is reduced; and welding of various blind cavity pipe fittings, liquid accumulators, one-way valves, auxiliary holes and other components can be met.

Description

Technical Field

[0001] The invention belongs to a conduit welding gas device, in particular to a conduit welding air blowing device and method. Background Art

[0002] The pump and valve module of the fluid circuit for aerospace is welded by a large number of valves, one-way valves, self-locking valves, pressure transmitters and liquid reservoirs. When welding the conduit, the inside needs to be filled with gas. The purpose is to protect the back of the weld from being oxidized by air and causing welding defects, and the inner wall air pressure balances the pressure of the electromagnetic blowing force on the outer wall of the weld on the molten pool to prevent the weld from concave.

[0003] Since some products have many internal flow channels, the distance from the weld to the air outlet is different, resulting in a large difference in air pressure at the weld. If the internal air pressure is small, pits are likely to appear on the weld. If the internal air pressure is large, the outer wall of the weld will bulge, which will affect the stability of the catheter welding quality and reduce the pass rate.

[0004] The utility model patent with patent publication number CN212492429U discloses an intelligent voltage-stabilizing, flow-controlling and proportioning device for welding gas, including an intelligent cabinet, a pressure-stabilizing gas tank inside the intelligent cabinet, an air intake manifold and an air outlet pipe connected to the pressure-stabilizing gas tank, a pressure-stabilizing device, an air intake pipe pressure sensor and a gas proportioning device on the air intake manifold, a plurality of air intake branches connected to the gas proportioning device, an air outlet pipe pressure sensor and a flow monitoring device on the air outlet pipe, a circuit board on the top of the intelligent cabinet, and the circuit board connected to an external current sensor. The utility model integrates three functions of mixed gas proportioning, intelligent distribution of welding gas and gas voltage stabilization into one, with a compact size and powerful functions. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a catheter welding blowing device and method.

[0006] The catheter welding blowing device provided by the present invention is characterized by comprising: a cross-way, a gas cylinder, a pressure reducing valve, a flow meter, a pressure gauge, a first catheter, a second catheter, a first long-handled ball valve, a second long-handled ball valve, and a third long-handled ball valve;

[0007] The first port of the cross-way is connected to the flow meter through a first conduit; the flow meter is connected to the gas cylinder through a pressure reducing valve 3; the second port of the cross-way is connected to the part to be welded through a second conduit 7;

[0008] The first port of the four-way valve is connected to a first long-handled ball valve, the fourth port is connected to a second long-handled ball valve, and the third port is connected to a third long-handled ball valve;

[0009] The third port of the cross is directly connected to a pressure gauge.

[0010] Preferably, the exhaust port inner diameter of the fourth port of the four-way pipe is 4-8 mm, and the pipe length is 40-60 mm;

[0011] Preferably, the flow range of the flow meter is not less than 25 L / min.

[0012] Preferably, the measuring range of the pressure gauge is not more than 1 KPa and not less than 0.5 KPa.

[0013] Preferably, the long-handled ball valve is a ball valve with an inner diameter of 6 mm.

[0014] The present invention provides a method for welding the above-mentioned catheter with an air blowing device, comprising the following steps:

[0015] Step S1: Connect the pipe welding blowing device to the process pipe to ensure that the blowing device is sealed and connected to the test process pipe;

[0016] Step S2: performing replacement degassing on the inner wall of the test process conduit;

[0017] Step S3: Observe and record the pressure reading on the pressure gauge to determine the air pressure on the inner wall of the test process conduit;

[0018] Step S4: starting the welding machine to weld the test process conduit, and determining the welding process parameters and inner wall pressure of the specification material of the current test process conduit;

[0019] Step S5, when the assembly of the parts to be welded meets the preset requirements, the duct welding blowing device is connected to the parts to be welded;

[0020] Step S6, adjusting the outlet pressure of the pressure reducing valve and the flow rate of the flow meter, closing the third long-handled ball valve, opening the first long-handled ball valve and the second long-handled ball valve, and performing replacement degassing on the inner wall of the part to be welded;

[0021] Step S7, after the air on the inner wall of the part to be welded is completely replaced, the third long-handled ball valve is opened to block the air outlet of the part to be welded to achieve sealing, the outlet pressure of the pressure reducing valve is adjusted, and the flow rate of the flow meter is adjusted, and the pressure reading of the pressure gauge is observed and recorded until it is consistent with that in step S4;

[0022] Step S8, start the welding machine to weld the parts to be welded, and observe the formation of the weld;

[0023] Step S9, after welding is completed, close the valve of the argon gas bottle, take out the catheter welding blowing device, and close the all-position welding system.

[0024] Preferably, step S2 further comprises: adjusting the outlet pressure of the pressure reducing valve, adjusting the flow rate of the flow meter 4, closing the second long-handled ball valve, and opening the first long-handled ball valve and the third long-handled ball valve, so as to achieve replacement degassing of the inner wall of the test process conduit.

[0025] Preferably, step S3 comprises: observing the inner and outer surface formation and surface color of the weld, the inner and outer surfaces formation and surface color of the weld are observed by endoscope, and the welding process parameters and inner wall air pressure of the specification material of the current test process conduit are determined.

[0026] Preferably, step S4 also includes: after the air on the inner wall of the test process conduit is replaced, opening the second long-handled ball valve, blocking the air outlet of the test process conduit, adjusting the outlet pressure of the pressure reducing valve, adjusting the flow meter flow, observing and recording the pressure reading of the pressure gauge to determine the air pressure on the welding inner wall.

[0027] Preferably, the step S5 also includes that the assembly gap and misalignment between the duct welding blowing device and the parts to be welded should be within 5% of the wall thickness to prevent excessive leakage from affecting the measurement accuracy.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention can realize the welding of multi-channel catheter components and monitor the air pressure of the welding inner wall in real time. The welding stability is good, the product welding quality and production and development efficiency can be improved, and the production cost can be reduced. It can meet the welding of various blind cavity pipe fittings, liquid storage tanks, one-way valves, process holes and other components.

[0030] The present invention transfers the exhaust hole position to the four-way position so that the size and distance of the exhaust holes of each weld are consistent, ensuring that the inner wall pressure of welds at different positions is the same, and quantifying the inner wall air pressure of the weld to be welded, thereby improving product accuracy and production and development efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 It is a structural schematic diagram of the pipe welding blowing device of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the connection between the pipe welding blowing device of the present invention and the process pipe

[0034] Figure 3 Schematic diagram of the dimensions of the cross in the embodiment of the present invention;

[0035] Figure 4 It is a schematic diagram of a welding check valve of a duct welding air blowing device;

[0036] Figure 5 It is a schematic diagram of a welding reservoir for a duct welding air blowing device.

[0037] The figure shows:

[0038] Cross 1 First conduit 6

[0039] Gas cylinder 2 Second conduit 7

[0040] Pressure reducing valve 3 First long handle ball valve 8

[0041] Flow meter 4 Second long handle ball valve 9

[0042] Pressure gauge 5 Third long handle ball valve 10 DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0044] In order to overcome the deficiencies in welding pump valve modules of aerospace fluid circuits in the prior art, the present invention provides a catheter welding air blowing device and method.

[0045] The pipe welding blowing device includes: a four-way valve 1, a gas cylinder 2, a pressure reducing valve 3, a flow meter 4, a pressure gauge 5, a first pipe 6, a second pipe 7, a first long-handled ball valve 8, a second long-handled ball valve 9, and a third long-handled ball valve 10;

[0046] The first port of the cross-way 1 is connected to the flow meter 4 through the first conduit 6; the flow meter 4 is connected to the gas cylinder 2 through the pressure reducing valve 3; the second port of the cross-way 1 is connected to the part to be welded through the second conduit 7; it is used to replace the air in the inner cavity of the product and maintain the inner cavity pressure during welding to ensure the stability of the welding process.

[0047] The third port of the cross-way 1 is directly connected to the pressure gauge 5, and the fourth port of the cross-way 1 is used for exhaust.

[0048] Gas cylinder 2 contains argon gas;

[0049] The first port of the four-way valve 1 is connected to a first long-handled ball valve 8, the fourth port is connected to a second long-handled ball valve 9, and the third port is connected to a third long-handled ball valve 10;

[0050] After the high-purity argon gas from the gas cylinder 2 is reduced in pressure through the pressure reducing valve 3, it enters the four-way valve through the flowmeter 4 and the first conduit 6. After entering the four-way valve, the argon gas flows into the other three ports respectively. Before welding, the third long-handled ball valve 9 is closed, and the first long-handled ball valve 8 and the second long-handled ball valve 10 are opened. The high-purity argon gas enters the inner wall of the conduit to be welded through the second conduit 7 to replace the air in the pipe. After the air on the inner wall of the conduit to be welded is completely replaced, the second long-handled ball valve 9 is opened, and the high-purity argon gas flows out from the exhaust port of the four-way valve, and the pressure drops.

[0051] According to actual needs, the pressure reducing valve 3 and the flow meter 4 are adjusted to the inner wall pressure of the welding area to meet the requirements, and then the welding is completed.

[0052] The exhaust port inner diameter range of the fourth port of the four-way 1 is 4 to 8 mm, and the blowing outlet pipe length is 40 to 60 mm; it is suitable for welding pipes with a diameter of 4 to 25.4 mm and a wall thickness of 0.5 to 2.54 mm.

[0053] The flow range of flow meter 4 should be no less than 25L / min.

[0054] The measuring range of pressure gauge 5 should not be greater than 1KPa and should not be less than 0.5KPa.

[0055] The inner wall pressure of the conduit of the component to be welded can be adjusted by adjusting the outlet pressure of the pressure reducing valve 3, the flow rate of the flow meter 4 and the outlet size of the third long-handled ball valve 9.

[0056] More specifically, the pressure gauge 5 is selected to have a range of 1 KPa, the pressure reducing valve 3 is selected to have a range of 0.2 MPa to 0.5 MPa, the flow meter range is selected to have a range of 0 to 25 L / min, the inner diameter of the connecting four-way conduit is selected to have an inner diameter of 6 mm, and the long-handled ball valve is selected to have an inner diameter of 6 mm.

[0057] The present invention also provides a method for welding a blowing device using a conduit, the steps of which are as follows:

[0058] Step S1: Connect the pipe welding blowing device to the process pipe to ensure that the blowing device is sealed and connected to the test process pipe;

[0059] Step S2: performing replacement degassing on the inner wall of the test process conduit;

[0060] The specific implementation method of step S2 is: adjusting the outlet pressure of the pressure reducing valve 3, adjusting the flow rate of the flow meter 4, closing the second long-handled ball valve 9, and opening the first long-handled ball valve 8 and the third long-handled ball valve 10, so as to achieve replacement degassing of the inner wall of the test process conduit;

[0061] Step S3: Observe and record the pressure reading of the pressure gauge 5 to determine the air pressure on the inner wall of the test process conduit;

[0062] The specific implementation method of step S3 is as follows: after the air on the inner wall of the test process conduit is replaced, the second long-handled ball valve 9 is opened, and the air outlet of the test process conduit is blocked, the outlet pressure of the pressure reducing valve 3 is adjusted, and the flow rate of the flow meter 4 is adjusted, and the pressure reading of the pressure gauge 5 is observed and recorded to determine the air pressure on the inner wall of the welding;

[0063] Step S4: Start the welding machine to weld the process conduit, observe the inner and outer surface formation and color of the weld, and observe the formation and surface color of the inner wall using an endoscope to determine the welding process parameters and inner wall pressure of the specification material of the current test process conduit.

[0064] Step S5, when the assembly of the parts to be welded meets the preset requirements, the duct welding blowing device is connected to the parts to be welded.

[0065] Among them, the assembly gap and misalignment between the duct welding air blowing device and the parts to be welded should be within 5% of the wall thickness to prevent excessive leakage from affecting the measurement accuracy.

[0066] Step S6, adjust the outlet pressure of the pressure reducing valve 3, adjust the flow rate of the flow meter 4, close the second long-handled ball valve 9, open the first long-handled ball valve 8 and the third long-handled ball valve 10, and replace and degas the inner wall of the part to be welded; the flow rate and time of the replacement gas are determined according to the volume of the inner cavity of the part to be welded.

[0067] Step S7, after the air on the inner wall of the part to be welded is replaced, open the second long-handled ball valve 9 to block the air outlet of the part to be welded to achieve sealing, adjust the outlet pressure of the pressure reducing valve 3, adjust the flow rate of the flow meter 4, and observe and record the pressure reading of the pressure gauge 5 until it is consistent with that in step S4;

[0068] Step S8, start the welding machine to weld the parts to be welded, observe the weld formation, and use an endoscope to observe the inner wall formation and color;

[0069] Step S9, after welding is completed, close the valve of the argon gas bottle, take out the pipe welding blowing device, and close the full-position welding system. The process pipe to be tested should have the same specifications, composition, and state as the parts to be welded;

[0070] The replacement flow rate and replacement time of step S2 and step 6 are determined according to the volume of the inner cavity of the component.

[0071] The assembly gap and misalignment between the duct welding blowing device and the parts to be welded should be less than 5%δ (δ is the wall thickness) to avoid air leakage at the joint and the drop in air pressure.

[0072] Based on the above embodiments, two specific examples are described below:

[0073] Embodiment 1:

[0074] like Figure 4 As shown: The present invention provides a method for using a catheter welding blowing device, and the implementation steps are as follows:

[0075] Step S1, the catheter welding blowing device is sealed and connected to the TA1 process catheter with a diameter of φ18 mm, an inner diameter of 1 mm, and a length of 300 mm.

[0076] Step S2, adjust the outlet pressure of the pressure reducing valve 3 to between 0.3 and 0.32 MPa, and adjust the flow rate of the flowmeter 4 to 25 L / min, close the second long-handled ball valve 9, open the first long-handled ball valve 8 and the third long-handled ball valve 10, and replace and degas the inner wall of the φ18×1mm TA1 process conduit for 30 seconds.

[0077] Step S3, open the second long-handled ball valve 9, and block the outlet of the TA1 process conduit, adjust the outlet pressure of the pressure reducing valve 3 to remain unchanged, adjust the flow rate of the flow meter 4 to 15L / min, and observe and record the reading of the pressure gauge 5 to be 0.1±0.01KPa;

[0078] Step S4, start the welding machine to carry out welding test, observe the inner and outer surfaces of the weld after welding to be silvery white, the weld excess height meets the preset requirements, and record the pressure gauge 5 reading as 0.1±0.01KPa.

[0079] Step S5, connect the pipe welding blowing device to the product. Figure 4 When welding one-way valves and two-way valves, the gap and misalignment at the welding point should be less than 0.05mm.

[0080] Step S6, adjust the pressure of the pressure reducing valve to remain unchanged, adjust the flow meter flow rate to 25L / min, close the second long-handled ball valve 9, open the first long-handled ball valve 8 and the third long-handled ball valve 10, and replace and degas the inner wall of the component for 1 minute.

[0081] Step S7, after the air on the inner wall of the component is replaced, open the second long-handled ball valve 9. The one-way valve requires a pressure of 9 KPa to open. When the second long-handled ball valve 9 is opened, the one-way valve automatically closes. Adjust the flow rate of the flow meter 4 until the pressure reading of the pressure gauge 5 is 0.1 ± 0.01 KPa.

[0082] Step S8, start the welding machine to weld the parts to be welded, observe the weld formation, and use an endoscope to observe the inner wall formation and color;

[0083] Step S9, after welding is completed, close the valve of the argon gas bottle, take out the catheter welding blowing device, and close the all-position welding system.

[0084] Example 2

[0085] like Figure 5 As shown, the present invention provides a method for using a catheter welding blowing device, and the implementation steps are as follows:

[0086] Step S1, the welding blowing device is sealed and connected to a 316L process conduit with a diameter of φ6 mm, an inner diameter of 1 mm, and a length of 300 mm.

[0087] Step S2, adjust the outlet pressure of the pressure reducing valve 3 to between 0.35 and 0.37 MPa, and adjust the flow rate of the flowmeter 4 to 20 L / min, close the second long-handled ball valve 9, open the first long-handled ball valve 8 and the second long-handled ball valve 10, and replace and degas the inner wall of the φ6×1mm 316L process conduit for 20 seconds.

[0088] Step S3, open the second long-handled ball valve 9, and block the gas outlet of the process conduit, adjust the outlet pressure of the pressure reducing valve 3 to remain unchanged, adjust the flow rate of the flow meter 4 to 10L / min, and observe and record the reading of the pressure gauge 5 to be 0.3±0.01KPa;

[0089] Step S4, start the welding machine to carry out welding test, observe the inner and outer surfaces of the weld after welding to be silvery white, the weld excess height meets the requirements, and record the pressure gauge 5 reading of 0.3±0.01KPa.

[0090] Step S5, connect the pipe welding blowing device to the product. Figure 5 When welding the liquid reservoir and the conduit, the gap and misalignment at the weld should be less than 0.05mm.

[0091] Step S6, adjust the pressure of the pressure reducing valve 3 to remain unchanged, adjust the flow rate of the flow meter 4 to 10L / min, close the second long-handled ball valve 9, open the first long-handled ball valve 8 and the third long-handled ball valve 10, and replace and degas the inner wall of the component; wherein, the air outlet is located on the liquid side conduit of the reservoir, and the replacement can be accelerated by opening and closing the second long-handled ball valve 9, and the speed replacement time is 4min.

[0092] Step S7, after the air on the inner wall of the component is completely replaced, open the third long-handled ball valve 9, block all outlets of the pump valve module, and adjust the flow rate of the flow meter 4 until the pressure reading of the pressure gauge 5 is 0.3±0.01KPa;

[0093] Step S8, start the welding machine to weld the parts to be welded, observe the weld formation, and use an endoscope to observe the inner wall formation and color;

[0094] Step S9, after welding is completed, close the valve of the argon gas bottle, take out the catheter welding blowing device, and close the all-position welding system.

[0095] The device and method of the present invention can realize the welding of multi-channel catheter components, and monitor the air pressure of the inner wall of the welding in real time. The welding stability is good, which can improve the product welding quality and production and development efficiency and reduce production costs; it can meet the welding of various blind cavity pipes, liquid storage tanks, one-way valves, process holes and other components.

[0096] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art, provides a duct welding blowing device and method, and makes the size and distance of the air outlet holes of each weld consistent by transferring the exhaust hole position to the four-way position, ensuring that the inner wall pressure of the welds at different positions is the same, and quantifies the inner wall air pressure of the weld to be welded, thereby improving product accuracy and production and development efficiency and reducing production costs.

[0097] The device provided by the present invention can measure the inner wall air pressure and has high stability in welding multi-channel conduits and parts; at the same time, the device can be applied to the welding of blind cavity welds and process holes. During welding, the pressure of the welding position can be adjusted in a variety of ways and the pressure of the welding position can be monitored in real time. The use of this device can significantly improve the consistency of products and welding efficiency

[0098] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A pipe welding blowing device, characterized in that: include: A four-way valve (1), a gas cylinder (2), a pressure reducing valve (3), a flow meter (4), a pressure gauge (5), a first conduit (6), a second conduit (7), a first long-handled ball valve (8), a second long-handled ball valve (9), and a third long-handled ball valve (10); The first port of the cross-connection (1) is connected to the flow meter (4) via a first conduit (6); the flow meter (4) is connected to the gas cylinder (2) via a pressure reducing valve (3); the second port of the cross-connection (1) is connected to the part to be welded via a second conduit (7); The first port of the four-way valve (1) is connected to a first long-handled ball valve (8), the fourth port is connected to a second long-handled ball valve (9), and the third port is connected to a third long-handled ball valve (10); The third port of the cross-port (1) is directly connected to a pressure gauge (5).

2. The pipe welding air blowing device according to claim 1, characterized in that: The exhaust port inner diameter of the fourth port of the four-way (1) is 4 to 8 mm, and the pipe length is 40 to 60 mm.

3. The pipe welding air blowing device according to claim 1, characterized in that: The flow range of the flow meter (4) is not less than 25 L / min.

4. The pipe welding blowing device according to claim 1, characterized in that: The measuring range of the pressure gauge (5) is not greater than 1 KPa and not less than 0.5 KPa.

5. The pipe welding air blowing device according to claim 1, characterized in that: The long-handled ball valve is a ball valve with an inner diameter of 6 mm.

6. A method for using the pipe welding blowing device according to any one of claims 1 to 5, characterized in that: The steps include: Step S1: Connect the pipe welding blowing device to the process pipe to ensure that the blowing device is sealed and connected to the test process pipe; Step S2: performing replacement degassing on the inner wall of the test process conduit; Step S3: Observe and record the pressure reading of the pressure gauge (5) to determine the air pressure on the inner wall of the test process conduit; Step S4: starting the welding machine to weld the test process conduit, and determining the welding process parameters and inner wall pressure of the specification material of the current test process conduit; Step S5, when the assembly of the parts to be welded meets the preset requirements, the duct welding blowing device is connected to the parts to be welded; Step S6, adjusting the outlet pressure of the pressure reducing valve (3), adjusting the flow rate of the flow meter (4), closing the second long-handled ball valve (9), opening the first long-handled ball valve (8) and the second long-handled ball valve 10, and performing replacement degassing on the inner wall of the component to be welded; Step S7, after the air on the inner wall of the component to be welded is completely replaced, the second long-handled ball valve (9) is opened to block the air outlet of the component to be welded to achieve sealing, the outlet pressure of the pressure reducing valve (3) is adjusted, and the flow rate of the flow meter (4) is adjusted, and the pressure reading of the pressure gauge (5) is observed and recorded until it is consistent with that in step S4; Step S8, start the welding machine to weld the parts to be welded, and observe the formation of the weld; Step S9, after welding is completed, close the valve of the argon gas bottle, take out the catheter welding blowing device, and close the all-position welding system.

7. The method of using a pipe welding blowing device according to claim 6, characterized in that: The step S2 further comprises: adjusting the outlet pressure of the pressure reducing valve (3), adjusting the flow rate of the flow meter (4), closing the second long-handled ball valve (9), and opening the first long-handled ball valve (8) and the third long-handled ball valve (10), thereby achieving replacement degassing of the inner wall of the test process conduit.

8. The method of using a blowing device for welding a conduit according to claim 6, characterized in that: The step S3 includes: observing the inner and outer surface formation and surface color of the weld, the inner and outer surfaces formation and surface color of the weld are observed by endoscope, and the welding process parameters and inner wall pressure of the specification material of the current test process conduit are determined.

9. The method of using a pipe welding blowing device according to claim 6, characterized in that: The step S4 also includes: after the air on the inner wall of the test process conduit is completely replaced, the second long-handled ball valve (9) is opened, and the air outlet of the test process conduit is blocked, the outlet pressure of the pressure reducing valve (3) is adjusted, and the flow rate of the flow meter (4) is adjusted, and the pressure reading of the pressure gauge (5) is observed and recorded to determine the air pressure on the inner wall of the welding.

10. The method of using a pipe welding blowing device according to claim 6, characterized in that: The step S5 also includes that the assembly gap and misalignment between the duct welding blowing device and the parts to be welded are within 5% of the wall thickness.

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