JB/T 9186-1999 JB/T 9186-1999 Carbon dioxide gas shielded welding process specification JB/T9186-1999 Standard download decompression password: www.bzxz.net

JB/T9186-1999
This standard is a revision of JB/Z286--87≤CO2 Gas Shielded Welding Procedures". The original standard was slightly changed during the revision, and the main differences are:
The writing method of this standard is in accordance with the current GB/T1.1 regulations; the scope of this standard is clarified;
The referenced standards are adjusted;
The provisions on production safety and Appendix A in the original standard are removed. This standard replaces JB/Z286--87 from the date of implementation. Appendix A of this standard is a prompt appendix.
This standard is proposed and managed by the National Welding Standardization Technical Committee. The responsible drafting unit of this standard: Tianjin Welding Research Institute. The main drafters of this standard: Jing Xiaotian, Wang Yang, Sheng Changyuan. This standard was first issued in 1987, and this revision is the first revision. 454
Standard of the Machinery Industry of the People's Republic of China
Welding procedure specification for CO2 shielded arc welding1Scope
JB/T9186—1999
Replaces JB/Z286—87
This standard specifies the basic rules and requirements for the implementation of thin wire (wire diameter not exceeding 1.6mm) carbon dioxide gas shielded welding. This standard is applicable to the carbon dioxide gas shielded welding process of carbon steel and low alloy steel. 2Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T324-1988 Symbolic representation of welds
Basic forms and dimensions of weld grooves for gas welding, manual arc welding and gas shielded welding GB/T 985—1988
GB/T2900.22--1985Electrical terminologyWelding machine GB/T3375—1994Welding terminology
GB/T5185—-1985Code for the representation of metal welding and brazing methods on drawings GB/T8110—1995Welding wire for carbon steel and low alloy steel for gas shielded arc welding GB/T 8118--1995
General technical conditions for arc welding machines
JB/T8748—1998MIG/MAG arc welding machines
HG/T2537—1993Carbon dioxide for welding 3 Terms and symbols
3.1 Terms
In addition to the terms specified in GB/T3375 and GB/T2900.22, this standard also uses the following terms. 3.1.1 Shielded gas line system A system that provides shielding gas to the arc zone, including: gas cylinders, heaters, pressure reducing valves, flow meters, gas valves and gas lines, etc. 3.1.2 Connecting cable Connecting cable A general term for all external conductive soft wires of the welding machine, including power cables, welding cables, and control cables. 3.1.3 Moving device for workpiece Moving device for workpiece A mechanism that enables the workpiece to move along the required trajectory during automatic welding. 3.1.4 Electrode extension The length of the electrode extending from the conductive tip during welding (1.), as shown in Figure 1. Approved by the State Bureau of Machinery Industry on June 24, 1999 and sold on January 1, 2000
3.1.5 Laminar flow
JB/T 9186
1—welding wire; 2—conductive tip 3—parent metal;
L,—electrode extension length; L—distance between conductive tip and parent metal Figure 1 Electrode extension length
Shielding gas flows in a regular laminar manner at a certain distance inside and outside the nozzle. 3.2 Symbols
The marking of welding symbols shall comply with the provisions of GB/T324 and GB/T5185. 4 Materials
4.1 Parent metal
The parent metal used shall comply with the corresponding material standards. 4.2 Welding wire
Welding wire shall comply with the provisions of GB/T8110.
4.3 Shielding gas
The carbon dioxide gas used in welding shall comply with the provisions of HG/T2537. 5 Welding machine and accessories
5.1 Semi-automatic welding machine and accessories (Figure 2) mainly include: a) welding gun (may include welding gun water cooling system); b) wire feeding mechanism (including welding wire reel and wire feeding hose); c) welding control device,
d) welding power supply;
e) shielding gas circuit system:
f) connecting cable.
5.1.1 The welding machine shall comply with the relevant provisions of JB/T8748. 5.1.2 The welding control device can realize the following welding program control: start
+advance ventilation (1~2s)
connect welding powerbzxz.net
(start welding)
wire feeding, double lead
+stop wire feeding-
+cut off welding power (stop welding)-
+stop gas after diving (2
JB/T 9186--1999
1Decompression threshold (heater, flow meter); 2-welding power supply; 3-welding control load: 4-wire reel + 5-wire feeding mechanism; 6--welding gun; 7--workpiece: 8-connecting cable; 9-gas cylinder Figure 2 Semi-automatic carbon dioxide arc welding machine and auxiliary equipment 5.2 Automatic welding machine and auxiliary equipment (Figure 3) include: a) welding gun (may include welding gun water cooling system); b) wire feeding mechanism (including wire reel) t
c) welding control device,
d) welding power supply,
e) walking mechanism or workpiece running mechanism!
f) shielding gas gas circuit system;
g) connecting cable.
1-pressure reducing valve (heater, flow meter), 2-welding control device; 3-wire reel; 4-travel mechanism; 5-wire feeding mechanism; 6-welding gun; 7-workpiece running mechanism; 8-workpiece; 9-connecting cable; 10-welding power supply, 11-gas cylinder Figure 3 Automatic carbon dioxide arc welding machine and auxiliary equipment 5.2.1 Automatic welding machine shall comply with the relevant requirements of GB/T8118. 5.2.2 The welding control device shall be able to realize the following welding program control: Start-→Pre-gas supply (1~2s)
Connect welding power supply
Wire feeding, arc ignition
Travel mechanism or workpiece running mechanism stops running Stop wire feeding
Welding current automatically decays
Travel mechanism or workpiece running mechanism operates (start welding) → Cut off welding power supply (stop welding)-Delayed gas stop (2~3s) A welding machine with appropriate rated current should be selected according to the welding current and actual load duration required during welding construction. 5.3
5.4 The welding machine should be maintained by a dedicated person and inspected regularly; if a fault occurs, it should be stopped immediately for inspection. 457
6 Welder
JB/T9186—1999
Welders must undergo theoretical learning and practical training in carbon dioxide gas shielded welding, and be assessed and obtain the corresponding qualification certificate before they can engage in related welding work.
7 Welding
7.1 Welding preparation
7.1.1 Appropriate welding auxiliary devices must be selected according to the welding position, joint form and operating efficiency. 7.1.2 Strictly inspect the welding machine and auxiliary equipment to ensure the normal operation of the circuit, water circuit, gas circuit and mechanical device. 7.1.3 The groove form and size of the weld can be determined according to GB/T985 and combined with specific working conditions. The recommended groove form and size are shown in Table 1.
7.1.4 The welding wire, groove and the area within 10 to 20 mm around the groove must be kept clean and free of foreign matter such as rust, oil, water and paint that may affect the welding quality.
7.1.5 The welding process of the product should be prepared according to the results of the process qualification test to determine whether preheating before welding, preheating specifications, interlayer temperature, welding process parameters, whether post-weld heat treatment and heat treatment specifications, etc. The content and requirements of the process qualification can be formulated by the manufacturer according to the product technical requirements or the results of negotiation between the supply and demand parties, and implemented after approval by the technical person in charge of the manufacturer. The results of the process qualification test should be filed for reference. The welding process qualification can be carried out according to the provisions of JB/T6963, and the specific welding process parameters can be selected by referring to Appendix A (Suggested Appendix). For the recommended process parameters, see Table 2. 458
JB/T 9186—1999
JB/T 9186--1999
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