This standard specifies the product classification, technical requirements, test methods, inspection rules, marking and packaging of portable micro welding torches. This standard applies to portable micro welding torches. JB/T 6968-1993 Portable Micro Welding Torch JB/T6968-1993 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Portable Micro Welding Torch
1 Subject Content and Scope of Application
JB/T 6968--93
This standard specifies the portable micro welding torch Torch's product classification, technical requirements, test methods, inspection rules, marking and packaging. This standard is recommended for portable micro welding torches. 2 Reference standards
GB192
GB196
GB 197
ordinary thread
ordinary thread
basic tooth form
basic Size
Ordinary thread
Tolerance and fit
GB5108
GB5109
3 product categories
Isobaric welding torch cutting torch|| tt||Jet-suction welding torch
3.1 Classification method
According to the assembly form of the welding torch and butane cylinder, the portable micro welding torch can be divided into two forms: integral and split 3.2 Structure
The structure of the portable micro welding torch is shown in Figure 1 and Figure 2. 3.3 Model number
The model number of the portable micro welding torch consists of letters, serial numbers and specifications that indicate its characteristics. Example 1:
H
Example 2:
B
B
1.2
means that the maximum thickness of welded low carbon steel is 1.2mm Indicates the product series model (A and B are integral) means portable
means micro
means manual
means welding torch
means welding mild steel with a maximum thickness of 3mm
means product series model (C means split type) means portable
means micro
means manual
means welding torch
Ministry of Machinery Industry of the People's Republic of China Approved on 1993-07-27 and implemented on 1994-07-01
555
16
15
12
11
10|| tt || JB/T6968 | | tt | Oxygen cylinder, 5 - welding torch butane gas knob? 6 - welding torque oxygen knob 7 - oxygen connector t8 - - butane gas connector 9 - welding tip; 10 - fixed frame; 11 - butane gas cylinder; 12 1. Gas bottle fixing clamp: 13-butane pressure gauge; 14-butane injection valve core; 15-butane gas bottle knob: 16-butane gas flashback preventer, 17-oxygen interface; 18-oxygen flashback prevention 5
Figure 2 Structure of the integral welding torch
1—Welding tip: 2—Safety valve: 3 Butane cylinder: 4—Base, 5—Pressure adjustment screw; 6—Welding Torch butane gas knob, 7-torch oxygen knob; 8-oxygen hose; 9-high-pressure oxygen meter; 10-screw plug; 11-oxygen cylinder high-pressure switch: 12-oxygen cylinder low-pressure switch: 13-low-pressure oxygen meter 3.4 basic Parameters
The basic parameters of the portable micro welding torch are shown in Table 1. 556
Type
No.
H03-BB-1.2
H03-BC-3
4Technical requirements
Welding tip number
1
2
3
1
2||tt| |3
JB/T6968-93
Table 1
Oxygen working pressure
MPa
0. 05~~ 0. 25||tt| |0.1~0.3
Butane gas working pressure
MPa
0.02-~0.25
0.02~-0.35
Flame core length||tt| |mm
>5
7
>10
≥6
8
≥11
4.1|| tt||The portable micro welding torch uses liquefied butane gas as fuel and industrial oxygen as supporting gas. 4.2 Each gas valve of the welding torch should ensure that the gas path can be opened and closed flexibly and the gas flow can be adjusted evenly. 4.3 All connections and air valves of the welding torch should be well sealed, and no air leakage is allowed under the following conditions: a.
b.
Oxygen passage: increase by 50% according to the maximum oxygen working pressure ;Butane gas passage: according to the maximum working pressure of butane gas. 4.4 The appearance of the welding torch should be beautiful and clean, without mechanical damage, bends or surface defects. Welding thickness
mm
0.2-0.5
0.5~0.8
0.8~1.2
0.5~3
4.5 welding torch matching Gas cylinders must be qualified products provided by manufacturers with production licenses. Gas path components should be made of corrosion-resistant materials.
4.6 The thread on the welding torch should comply with the relevant regulations of GB192, GB196, and GB197. The thread pitch at the seal should have sufficient adjustment margin. 4.7 The flame burning of the welding torch should be stable, and no deflection, bending, tempering, etc. are allowed. 4.8 The welding torch should be guaranteed to be able to be used normally within the temperature range of -30 to +40°C. 4.9 Under normal operating conditions, the maximum flame temperature of the welding torch should be higher than 2000°C. Under normal operating conditions, the flame core length of the welding torch should comply with the requirements in Table 1. 4.10
4.11
4.12
The safety factor of the integral micro welding torch should be greater than 3. Portable micro-torches must be equipped with reliable flashback prevention devices. 5 Test methods
5.1 Air tightness test
The welding torch is passed through the gas without grease under the pressure conditions specified in Article 4.3, and placed in the two states of the gas valve closed and open. 205 in water continuously, and all air valves and all connections must not leak. 5.2 Combustion test
Carry out the combustion test under normal operating conditions. The welding torch shall comply with the provisions of Articles 4.7 and 4.10. 5.3 Temperature test
Conduct temperature test under normal operating conditions. The welding torch shall comply with the provisions of Article 4.9. 5.4 Safety valve opening test
When performing the safety valve opening test on the integral welding torch, the gas cylinder is in a closed state and pressurized from the outlet of the mixing chamber. The pressure when the safety valve is open and leaks shall not be less than 0.25MPa.
5.5 Safety factor test
When performing the safety factor test on the integral welding torch, pressurize the butane cylinder to the test pressure and maintain it at the test pressure for 30 minutes. The ratio of the test pressure when the cylinder is damaged to the butane gas limit pressure of the cylinder at 40°C should be greater than 3. 557
6 Inspection Rules
JB/T6968—93
6.1 The product must be accompanied by a product certificate and instructions for use when it leaves the factory. 6.2 Factory inspection
When the product leaves the factory, it shall be inspected in accordance with the requirements of Articles 4.2, 4.3, 4,4 and 4.10 of this standard. 6.3 Type inspection
When one of the following situations occurs, type inspection should generally be carried out: a.
b.
c
d.
e.
Trial prototype identification of new products or old products transferred to factory production; under normal production conditions, every year or when the production reaches 3,000 units (whichever is lower); after formal production, such as structure, materials, When there are major changes in the process that may affect product performance; when the product is resumed after half a year of suspension; when the factory inspection results are significantly different from the last type inspection; f. bzxz.net
The national quality supervision agency proposes to conduct type inspection upon request. During type inspection, a comprehensive assessment shall be carried out according to the technical requirements specified in this standard. When necessary, additional test projects may be added through negotiation between the supply and demand parties.
6.4 Appearance, air tightness test and combustion test, the sampling quantity is 0.5% of each batch, but not less than 5 sets. 6.5 If there are any unqualified items during the random inspection, the unqualified items should be double re-inspected. When all re-inspections pass, only the products that failed the initial inspection will be returned for repair. If there are still unqualified items after inspection, no matter how many, the batch of products will be regarded as unqualified products and must be repaired and resubmitted for acceptance. 7 Logo and packaging
7.1 Each set of welding torch and accessories is packaged in a separate suitcase. Suitcase-style packaging should be portable and strong enough. Several suitcases are packed into one carton. The carton packaging should be beautiful and sturdy to ensure that it is not damaged under normal transportation conditions. 7.2 The carton packaging should have the following markings: a.
b.
d.
Product name, model:
Manufacturing date or production batch number;
Mark of vulnerable items;
Name of manufacturer, etc.
Additional notes:
This standard is proposed by the National Welding Standardization Technical Committee. This standard is under the jurisdiction of the Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard was jointly drafted by Heilongjiang Printing Technology Research Institute, Shanghai Welding and Cutting Tool Factory and other units. The main drafters of this standard are Xue Xiangyuan, Pu Dongguang, Liu Bochun, Shen Yicheng, and Wang Licheng. 558
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