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JB/T7947—1999
This standard is a revision of JB/T7947—95 "Isobaric welding torch, cutting torch". This standard replaces JB/T7947—95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Welding Standardization. The drafting unit of this standard: Harbin Welding Research Institute. The main drafters of this standard: Lv Zhenjie, Liu Hongge, Zhang Xihe. 595
Mechanical Industry Standard of the People's Republic of China
Isobaric welding torch, cutting torch
Equal pressure welding torch and cutting torchJB/T 7947--1999
Replaces JB/T7947-95
This standard is applicable to general single-flame isobaric welding torch, cutting torch and welding and cutting dual-purpose torch. It is used for oxygen-acetylene welding, cutting and other various flame processing (brazing, preheating, etc.) of metals. 2 Types and basic parameters
2.1 The welding torch adopts the tube-changing type, and the cutting torch adopts the cutting nozzle with different aperture sizes to meet the needs of welding and cutting workpieces of different thicknesses. The type of welding and cutting dual-purpose torch is based on the type of welding torch and cutting torch. 2.2 Model: The model of the welding and cutting torch consists of Chinese phonetic letters, the serial number representing the structure and the specification. The model of the welding and cutting torch is shown in Table 1. Table 1 Model of welding and cutting torch
Symbols in Table 1:
H02-12
H02-20
Indicates the
th letter of welding (Han)
Indicates the first letter of cutting (Ge);
Indicates manual recording
Indicates isobaric type;
12;20—-Indicates the maximum thickness of welding low-carbon steel, mm; 100; 200300—Indicates the maximum thickness of cutting low-carbon steel, mm. 2.3 The schematic diagram of the welding and cutting torch is shown in Figures 1 and 2. 2
G02-100
G02-300
1—welding torch 32—mixing tube nut; 3—mixing tube joint; 4—oxygen joint thread; 5—oxygen nut 6—oxygen hose joint; 7—acetylene joint thread; 8—acetylene nut; 9—acetylene hose joint Figure 1 Schematic diagram of welding torch
Approved by the State Machinery Industry Bureau on June 24, 1999
Dual-purpose welding and cutting torch
HG 02-12/100
HG02-20/200
2000-01-01 implementation
JB/T7947-1999
G02-100 type
1-cutting nozzle; 2-mouth nut + 3-cutting nozzle joint; 4-oxygen joint thread; 5-oxygen nut; 6-oxygen hose joint, 7-acetylene joint thread: 8-acetylene nut, 9-acetylene hose Pipe fitting E
G02-300 type
1—cutting nozzle, 2—cutting nozzle nut; 3—cutting nozzle connector; 4—oxygen connector thread; 5—oxygen nut; 6—oxygen hose connector; 7—acetylene connector thread, 8—acetylene block nut; 9—acetylene quick hose connector Figure 2 Schematic diagram of cutting torch
The main parameters and basic parameters of the welding and cutting torch are shown in Table 2, Table 3, Table 4 and Table 52.4
Table 2 Main parameters of the welding and cutting torch Main parameters
Welding and cutting torch
H02-12
H02-12
H02-20
G02-100
G02-300
HG02-12/100
HG02-20/200
Welding low carbon steel thickness
Table 3 Basic parameters of welding torch
Oxygen torch Working pressure
Acetylene working pressure
Thickness of cutting low carbon steel
3～~100
3～300
3～200
Flame core length
Total torch length
H02-20
G02-100
G02-300
HG02-12/100
JB/T 7947--1999
Table 3 (end)
Oxygen working pressure
Acetylene working pressure
Notes·Basic plug number of cutting torch
Cutting oxygen batch control
Oxygen working pressure
Acetylene working pressure
Table 5 Basic parameters of welding dual-purpose torch
Oxygen working pressure
Acetylene working pressure
Flame core length
Visible cutting oxygen flow length
≥100
≥100
≥130
≥150
≥170
Flame core length
Total length of welding torch
Total length of welding torch
Visible cutting oxygen flow length
≥100
Welding and cutting torch
Total length
HG02-20/200
3Technical requirements
JB/T 7947—1999
Table 5 (end)
Oxygen working pressure
Acetylene working pressure
Flame core length
Visible cutting flow length
≥100
≥110
≥130
Welding and cutting torch
Total length
3.1 Under the oxygen and acetylene working pressures specified in this standard, adjust the flame to a neutral flame, and the flame should be clear. The flame core length of the welding torch and the visible cutting oxygen flow length of the cutting torch should not be less than the relevant provisions in Tables 3 to 5. 3.2 Each gas valve should ensure flexible closing of the gas path and uniform flow adjustment. 3.3 The flame of the welding and cutting torch should burn stably, without deflection, bending, backfire and explosion. When a wind of 10 m/s (6 m/s for nozzles with a diameter of less than 1 mm) blows vertically toward the flame, the flame core should remain stable. 3.4 All connections and gas valves of the welding and cutting torches shall not be gassed under the following inlet pressures. 3.4.1 In the oxygen passage: increase the maximum oxygen working pressure by 50%, but the maximum is 1.2 MPa. 3.4.2 In the acetylene and mixed gas passages: the pressure is 0.25 MPa. 3.5 All gas passage parts of the welding and cutting torches shall be made of corrosion-resistant materials. The parts of the acetylene passage shall not be made of alloys with a copper content of more than 70%.
3.6 The mating surfaces between the mixing pipe joint and the middle connector of the welding torch and the cutting nozzle and the cutting nozzle joint of the cutting torch shall ensure airtightness and interchangeability. The dimensions are shown in Figures 3, 4, 5, 6 and 7.
Figure 3 Welding torch mixed nut
Figure 4 Welding torch mixed pipe joint
Figure 5 Cutting nozzle
9'1X7W
JB/T7947-1999
11-- [3
Figure? Cutting joint
Figure 6 Cutting nozzle nut
3.7 The oxygen joint thread, acetylene joint thread, oxygen pipe joint, acetylene pipe joint, oxygen nut and acetylene screw of the rear connection body shall comply with the following regulations:
Oxygen joint: threaded joint M16×1.5
Acetylene joint: threaded joint M16×1.5
Oxygen pipe joint: oxygen hose joint type B5.2Acetylene pipe joint: gas hose joint type B$6.2Oxygen nut: oxygen nut M16×1.5
Acetylene nut: gas nut M16X1.5
3.8Before assembly, all parts of the gas passage must be degreased. 3.9The appearance of the welding torch should be beautiful and neat.
3.9.1The solder at the welding part should be evenly hooked without obvious outflow. 3.9.2The appearance should have no obvious mechanical damage, misaligned bends and surface defects. 3.9.3 The handle, hand wheel and other connection parts shall not be loose. 3.10 When welding and cutting nozzles are supplied separately, they shall comply with the relevant provisions of 2.4, 3.1, 3.3~3.6. 600
4 Test methods and acceptance rules
4.1 Test methods
4.1.1 Air tightness test
JB/T 7947.1999
The welding and cutting torch is passed through a grease-free gas at the pressure specified in 3.4. With the gas valve closed and open, it is placed in water for 20 seconds. There shall be no leakage at any gas valve and all connections. 4.1.2 Combustion test
Carry out a combustion test at the oxygen and acetylene working pressures specified in this standard to check whether the welding and cutting torch meets the requirements of 3.1 and 3.2. 4.1.3 Anti-flashback test of welding torch
a) Test conditions
Anti-flashback test plate (see Figure 8).
The test welding torch H02-12 uses a No. 3 welding nozzle, and H02-20 uses a No. 4 welding nozzle. The end face of the welding nozzle is parallel to the test plate, and the distance between them is 2mm. The welding torch is fixed (see Figure 9).
104 grooves are arranged radially on the surface of 6i(r, and the radial angle between the grooves is (.573
The center line of the first groovewwW.bzxz.Net
Material: copper
Figure 8 Anti-flashback test plate
The rotation speed of the test plate is 10r/min.
The test radius is R100 (1+0.4logQ) (mm), and Q is the rated flow rate of the combustion gas of the welding torch (L/h). b) Test procedure
Ignite the welding torch and adjust it to a neutral flame according to the rated flow rate. After stabilization for 30 seconds, start rotating (the flame cannot be adjusted during the rotation period), and rotate 5 times for each test.
c) Acceptance requirements
JB/T7947--1999
Figure 9 Anti-flashback test
Flashback test plate
The welding torch is qualified if it does not flash back after 5 rotations (continuous explosion is allowed). If continuous flashback occurs, the test must be stopped, and the welding torch (nozzle) must be cooled and cleaned before repeating the test twice (cooling after each test). If flashback does not occur (continuous explosion is allowed), it is still qualified. 4.1.4 Stability test in wind
Ignite the welding (cutting) torch equipped with a welding (cutting) nozzle (H02-12 is nozzle No. 3, H02-20 is nozzle No. 4; G02-100 is nozzle No. 3, G02300 is nozzle No. 5) and adjust it to a neutral flame according to the specified flow rate. After stabilization for 30 seconds, make the flame perpendicular to the wind direction and place it at a wind speed of 10m/s. If the flame core of the welding (cutting) torch can burn normally within 10 seconds, it is qualified. If the flame core jumps, extinguishes or backfires, repeat the test twice. If the flame core can burn normally, it is still qualified.
4.2 Acceptance rules
4.2.1 The appearance quality shall comply with the provisions of 3.9. 4.2.2 The product must be accompanied by a product certificate and instruction manual before leaving the factory. 4.2.3 The user has the right to inspect the delivered products according to the test methods and acceptance rules specified in this standard. 4.2.4 The number of random inspections for appearance, air tightness test, combustion test and main dimension inspection of main parts is 0.5% of the number of each batch of delivery, but not less than 5 sets.
4.2.5 During random inspection, if there are unqualified items, double sampling should be carried out for re-inspection of unqualified items. When all re-inspections are qualified, only the unqualified products in the initial inspection will be returned for repair. If there are still unqualified items after re-inspection, no matter how many, the batch of products will be regarded as unqualified and must be repaired and resubmitted for acceptance. 5 Marking and packaging
5.1 Marking The welding torch should be marked with: manufacturer's name, trademark, model, year and month of manufacture and oxygen and acetylene inlet positions. Oxygen valves should have a blue mark, and acetylene block valves should have a red mark. The welding nozzle should be marked with the trademark, model and number. The positions of various marks should be obvious, and the handwriting and patterns should be clear. 5.2 The small package should be beautiful and sturdy, and marked with the product name, model and manufacturer's name. Large packages should be sturdy, meet transportation requirements and relevant regulations, and indicate the product name, model, quantity, gross weight, net weight, volume, year and month of manufacture and factory name. The handwriting should be neat and clear. 5.3 When welding and cutting are supplied separately, they should be packaged in small cartons or plastic bags (boxes). Each carton or plastic bag (box) can only hold one model of welding and cutting nozzles, and indicate the product name, model, nozzle number, quantity, trademark or factory name. Large packages should comply with the provisions of 5.2. 602
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