JB/T 9071-1999 TIG welding procedure and welding procedure qualification for aluminum air separation equipment
Some standard content:
JCS 71.100.20
Machinery Industry Standard of the People's Republic of China
JB/T 9071-1999
Chlorine arc welding of aluminum air separation equipment
Technology specifications and welding procedure qualificationsforair separation plants constructed of aluminium alloys1999-07-12 issued
National Machinery Industry Bureau
2000-01-01 implementation
JB/T9071—1999
Quoted standards
Basic requirements
Preparation before class
7 Requirements for welding technology
Implementation regulations for the assessment of welding technology for aluminum and aluminum alloys
Appendix A (Appendix to the standard) List of types of joints and environments (Appendix to the standard)
Examination rules for lead and shipbuilding alloy workers
IB.T 07t-1999
This standard is a revision of the JB/Z16?89 aluminum air separation equipment welding process specification. Compared with JB/Z16?89, the main technical content of this standard has changed as follows: the name of the standard has been changed to "Low-altitude welding process and welding process assessment for lead-aluminum air separation equipment". The welding wire and wire specified in Table 1 have been modified according to the latest standards. The argon arc welding process specifications in Tables 3 to 6 of the original standard have been deleted. The assessment of aluminum and lead alloy welding joints and the special test rules for lead and aluminum alloy welders (including welding process) have been added. Automatic and semi-automatic reduction! And other internal proposals. This standard replaces 1316? .89 from the date of implementation. The non-standard parts A and appendix are the parts for reference. This standard was proposed and approved by the Technical Change Meeting for Standardization of Gas Separation and Oxygen Generation Equipment. Standard drafting unit: Kangzhou Oxygen Generation Group Co., Ltd. The main authors of the standard: Tu Huan, Xu Zhifeng. 2 The standard was first issued in July 1981.
Machinery Industry Standard of the People's Republic of China
Fluorine Arc Welding of Aluminum Air Separation Equipment
Process Specification and Welding Process Qualification
Argon shiehed are weldiag prgcedure specificarinnand welding prncedurequaliricaliuns tor wir separatun plaats cunstrueled oralumniniuu alluys1
JB/T 9071-1999
代/Z [67—-89
This standard specifies the basic process requirements for oxygen welding of gas separation equipment (hereinafter referred to as air separation equipment) to be followed, and provides for the qualification and control of tungsten electrode rectifier torch and melting arc welding in the manufacture and installation of aluminum air separation equipment. 2 Reference standards
The following standards contain the following clauses: The clauses quoted in this standard or marked as this standard are valid for the six editions published in this standard. All standards will be revised, and the parties using this standard should consider the possibility of using the standard version. GB150—1998
GA.T9—[996
GB.T 4842—1995
GB.T[0858—1989
JD4730—1994
Steel small container
Deformation and alloy chemical formula
Aluminum and alloy welding wire
Nondestructive testing of pressure vessels
Safety technical supervision regulations for pressure vessels
3 Basic requirements
31 The welding process in the manufacture and installation of aluminum air separation equipment shall comply with the provisions of relevant standards in addition to the basic requirements. 31 The welding procedures and process assessment used in the manufacture and installation of aluminum air separation equipment must be qualified and the requirements of the relevant standards are as follows: 3.3 The arc welders who manufacture and install aluminum air separation equipment must be trained, pass theoretical and practical examinations, and obtain corresponding certificates.
3.3.1 The test specifications for the current welding shall be in accordance with the provisions of the standard (Appendix: 3.3.2 The welding of special products can be increased according to the actual situation and the test items: 3.4 The original system is harmful 1: Attack protection measures must be taken during manufacturing and installation, + materials
4.1 The parent material used shall comply with the provisions of GB/T3190, and the welds used shall comply with the provisions of GRT10R58 and relevant standards. 4.2 The materials and welding wires must have material certificates. If the content of the material certificate is incomplete or it is necessary, the material can be inspected. 4.3 The commonly used parent materials and recommended coal wires are shown in Table 1. National Rope Machinery Industry Fan 1999-07-12 Approved
2000-01-01 Implementation
By the division number
JB/T9071—1999
3.621+5.6.02
XAIMyS
(or i.FH)
SAJMg3
5183）
3421+5083
4.4SAISi5 welding wire can be used for welding and repair welding of general aluminum alloy, but shall not be used for welding of ferrous alloy4.5 The welding energy shall comply with the provisions of GBT48424.6 The recommended gas for welding is selected. 5 Bevel preparation
5.1 The bevel size and assembly requirements of the welding joint shall comply with the requirements of the sample and the welding process and the relevant standards. 1493www.bzxz.net
5.2 The treatment of the burr processing is limited to the welding grooves with mechanical treatment and plasma cutting. Before firing, the grooves should be pounded or machined to completely remove the oxides, and the grooves without burr should be polished until the metallic luster is exposed. 5.3 The welded grooves should be inspected after processing. The unevenness, delamination, fire impurities, and the number of defects that affect the welding quality should be eliminated.
5.4 The selection of the typical welding joints of short arc welding and initial arc welding and flat arc welding shall be in accordance with the provisions of the Appendix of the Standard A.
5.5 The welding joints and burr cutting types not recommended by this standard can be reasonably selected according to the product structure. 5.6 When butt welding plates of different thicknesses, when the difference in thickness is 6 cmm, it is not necessary to thin the plate; if the difference in thickness is 48 ± 3 mm, the thick plate should be thinned by 14°, or the thickness should be > 44°. Figure 1 and Figure 2 If the nominal thickness difference between the plate and the end cap is 4 ± 2 mm, it is necessary to thin the plate: when the thickness difference is 4 ± 2 mm, it should be thinned according to Figure 1 or Figure 2. 1 Butt welding between plates of different thicknesses Figure 2 Butt welding between plates of different thicknesses 6 Dry welding standard 6 Before welding, the weldment and dry wire must be cleaned, and the oil and oxidation reaction must be removed. If there are small pieces of miscellaneous parts on the installation site, after the base material is degreased, the chemical film within the range of 30-50 mm on both sides of the groove should be removed by mechanical or chemical methods. 6.1. Chemical cleaning
Put the weldment or short wire in sodium hydride solution with a concentration of % and a temperature of 6~70°C for 1~3 minutes, then rinse with pressure cleaning agent, and then place the weldment in a 30% acid solution for 1~2 minutes, take it out and rinse it with disinfectant water, and finally treat it with coal: If the chemical cleaning film does not reach the required part, it can be removed by machine or cleaning. 6.1.2 Machine cleaning
Use a stainless steel wire brush (wheel, zinc knife, scraper, etc.) to clean the weldment according to the required surface, and point to the depth of the metal removal. Do not use a wheel or emery cloth.
For the package 6.2 After the welding wire is cleaned, it is not necessary to perform chemical cleaning on the welding wire. Otherwise, it needs to be cleaned for a year. 6.3 The cleaning wire should not be stored for too long. It is strictly forbidden to roll in contaminants. If the wire is damaged after cleaning, it should be cleaned again after the expiration.
6.4 The damaged wire must be stored and kept in a safe place. It must not be affected by moisture or corrosion. In order to distinguish the different brands of welding wire, various marks should be made to distinguish them.
7 Welding process requirements
7.! The new arc welding equipment is in good condition. 7.2 When arc welding is carried out in a cold weather environment, measures should be taken to prevent wind and rain. When any of the following conditions occurs in the welding area, welding shall not be carried out without special measures: 9) Humidity is greater than 90%; b) Temperature is lower than 5: c) Wind speed is greater than 2m/: +.31 Before welding, the brand of the source and wire must be clearly identified, as well as the working conditions and general technical requirements of the welding parts, and the source must be applied strictly in accordance with the welding process requirements. 4) When the arc is struck, it shall not be struck directly on the weldment or welding area. 7.5 When welding, the lead-in plate and the lead-out plate are used. 7.6 The same wire size and the same conditions as those used for welding the workpiece should be used for close welding. . When arc welding occurs and welding wire or metal is oxidized, welding should be stopped. Metal touching the part should be removed. 7.8 The weldment and the grounding wire should be reliably connected to avoid arcing between the weldment and the grounding wire and damaging the surface of the hot workpiece. 7. The arc extinguishing pit should be filled and higher than the base metal. 7.10 For argon arc welding of workpieces with a thickness of 10mm or above, the preheating temperature generally does not exceed 15°C. The specific preheating temperature depends on the thickness, shape, rigidity of the joint and the temperature and humidity of the environment. Preheating can be done by a short air gun. It is advisable to use a neutral flame or a weak reducing box, and try to heat from the back or both sides to reduce oxidation. After heating, it can be cleaned mechanically. .11 When there are multiple layers, the oxide film should be cleaned by mechanical methods after each layer. The temperature should not exceed 50. 7.12 During the welding process, the weld seam should be cracked and continued after repair. 7.13 The sensitivity of the internal pores and the non-permeability during heating should be avoided as much as possible. At the same time, the welding process should be completed as much as possible. 7.14 When the semi-automatic hydrogen welding method is used, if the conductive nozzle, spray belt, and diverter sleeve are melted into the welding chain, the selected part must be welded after all the metal is removed before welding. 7,15 The single-sided welding of the same stainless steel electrode should contain the following rules: 7,15,1 Before the stainless steel is cracked, remove the oil and dirt, and the surface is mixed. 7.15.2 The preparation of the hot ring is based on the light (or unfolded length) of the workpiece. Cut off the lead and the burning steel strip, and roll the stainless steel strip. After the manual arc welding, the selected aluminum strip is scattered. Finally, weld the mold together with AC manual hydrogen arc welding. The above-mentioned points should be ground and leveled. The stainless steel group should be mechanically excavated during the production process. 7. 15.3 Group the parts 1 and fix them with fixed welding (such as 3), then insert the gasket into the part 2, adjust it to the specified size (15~Bmm) and insert it into the gap. Finally, weld the parts 1, 2 and the embedded part with positioning welding. The material of the gap is the same as that of the parts 1 and 2. 7, 15.4 Joint. 3 The number of joint layers of the positioning welding block shall not be less than two layers: the stainless steel strip shall not be melted during the jointing. When welding to the positioning seam, stop the welding, scrape off the position welding and embedded blocks, and then continue welding. 7.15.5 If stainless steel shrinks during welding, the welder shall stop welding immediately and inform the inspector. After inspection, the weld metal of the corresponding part shall be scraped clean, and the position and the traces of stainless steel shrinkage shall be recorded. If no defects or any changes in the shape of the melting trace are found in the furnace seam X-ray film, the weld metal at the position shall be rated as non-standard. 7.16 The repair or repair welding of the same weld seam shall not be repeated more than twice. Before repair welding, the welder shall remove defects and re-test the weld area, and then repair welding.
Repairing should have a repair plan. Repairing more than twice should be approved by the technical director of the unit. 7.1 The appearance quality of the weld chain should comply with the provisions of B5.1. The undercut with a depth of more than .5mm should be repaired by welding. The repair should be carried out before the damage test.
7.18 Nondestructive testing of weld groups
) The screening coefficient is 1. For Class I pressure vessels and pressure vessels that use gas instead of water for pressure resistance testing, 4. 100% of the products are selected: Radiographic inspection type, and its evaluation level should not be lower than Class II in 6.3 of 4730-1994. b) Except for the other pressure vessels in the safety technical supervision system of pressure vessels, 3 supervision of the national standard, 4. Radiographic inspection of Class B original seams The damage ratio should not be less than 20% of the length of each weld, but the joint chain and the longitudinal ring weld intersection T seam trace 100% radiographic inspection JB/T9071-1999
, its evaluation level does not follow the mountain damage of 1B4730[994 sequence 6.3 c) The container and industrial pipeline within the scope of this supervision regulation must be calculated according to the level of damage and relevant standards.
8. Regulations on the evaluation of aluminum and aluminum alloy welding process 8.1 Material grouping and thickness determination
8.1.1 Material grouping is in accordance with the provisions of Table 2. For materials not listed in Table 2, the manufacturing and installation units can group them according to the common properties, chemical properties, and mechanical properties.
Alloy (metal alloy) name
Alloy
Alloy containing less than or equal to 4% aluminum Alloy containing more than 2% tantalum
Typical materials
1A99, 1A97, 1A95, 1A93, 1A96, 1A85, 1070A1060.1050.A, 1035, 1200
5A02.5A03
5083, 5A05, 5A0G, 5F05
8.1.2 Under the premise of the original parameters, the welding process of different grades of materials in the same group can be replaced: the welding process of different materials cannot be replaced; different grades of materials in different groups, whether they have been evaluated or not, must be re-evaluated. 81.3 The welding process of butt weld test pieces that have been qualified for evaluation shall be based on the effective table and table of weld base metal thickness and weld joint thickness of the welded parts. The effective range of each degree of the welded parts shall be the minimum of 3T, and the effective range of each degree of the welded parts shall be 5T. Note: It refers to the weld joint thickness applied by a welding method (or welding process) on the test piece. 1.4 Butt joints with the same basic parameters shall be specified in the following table. |1.5 After a welding joint has been qualified through multiple welding methods, if the basic parameters remain unchanged in production, one or more welding methods can be used, such as the market light, etc. 8.2 Main parameters and minor parameters
JR/T9071-1999
8.1.1 Main parameters refer to the welding process factors that affect the tensile strength and bending properties of the welded joint. Minor parameters refer to the welding process factors that have no obvious effect on the mechanical properties to be measured. 8.2.2 When one of the following main parameters is changed, a new welding process assessment must be carried out: a) Change the welding force method: b) Change the filler metal or the component; c) Change the heat temperature ratio of the item; e) The welding temperature is not qualified. Increase or decrease more than 50; small production thickness exceeds the provisions of 8.1.3.
R, 2.3 When the following minor parameters are changed, the process assessment can be carried out without updating: a) single-sided welding is changed to double-sided welding or vice versa, single-pass welding is changed to strip layer (pass) welding or vice versa; 6) Change the parameters of the city 11 (groove angle, bluntness, gap); 2 Change the welding current, arc voltage, oxygen concentration, pin diameter, increase or eliminate the pad inspection: change the welding position;
e) Change the size of the filling metal.
%, 3 The appearance quality of the welding seam shall comply with the provisions of R5.1 4 Non-destructive testing of the test piece
10% of the test piece seams shall be subjected to radiographic transparency testing, and the welding results shall comply with the 4730 grade. 8 .5 Sample verification and testing
8.5.1 The required size of the test plate and the order of the sample are shown in Figure 4. The sampling sequence of the tubular or component is shown in Figure 5.4uo
Figure 4 Test piece sampling sequence
Use 5 tubes to collect the test piece sampling sequence
8.5.3 Number of samples
2 for tension, 2 for back, 2 for face bending
JB9071-999
8.5.3 The cross section of the test bar shall be doubled. If the sampling method is adopted, each sample must have a surface area of not less than 5mm. 8.5.4 What samples should comply with the provisions of GB150--1998: The cold bending test sample shall comply with B5.6 and Figure B5. 8.5.5. The tensile strength of the pre-tension test is usually marked as follows:
a The numerical value of the product drawing:
The lower limit of the standard tensile strength of the parent material:
(center) For welded joints composed of internal single materials of different tensile strength levels, it is the smaller of the two internal standard tensile strength values. 8.5. 6 Test volume
Bending quantity and assessment requirements by diameter, support spacing rate: 5.6.1 Modify Table B4. When there is a significant difference in the bending performance between two materials or between the weld metal and the step material, the longitudinal (face and back) bending test can be used instead of the longitudinal (face and back) bending test. The specimen type is shown in Figure 6. The test method and qualified value assessment are the same as those for the transverse bending test: 3155
18-Test plate original:, -Cheng column thickness: positive bird
210m, S,>10a, the sample surface T is m-high-strength parent material single
Figure, longitudinal bending specimen
JBT9071-1999
When recording A
【Appendix to the standard】
Typical welding joints and types of joints
A1 Aluminum air separation equipment hydrogen arc welding joints [1 type connection table A" is now specified. At
Some joints are set
Insulating method
Hand. 1 So arc single-sided
For E series welding double-sided
Hand positive oxygen arc blasting double-sided blasting
Under the work point butt welding double-sided core is good
Bottom, hand hydrogen energy incendiary level return to
Cultivate extremely white oxygen extension welding double white
Small container, bone through the group seam,
Small bath, general natural dish
Container ring
Container broken chain
If the container is scratched, the broken chain
Good repair head
JB.T 9071-1990
Mai AI (continued)
Coal connection method
Hand 1 single and effective
Hand 1 now fried chicken double-sided
Real: burn double-sided parts to hit
bottom, grid chemical extreme automatic cylinder welding outside
.1 one ratio double interval time description
lower 1. High welding efficiency at the same time
lead, external description needs to steal
Self-effective
Cannot enter your double-sided device
Welcome to enter
Allow non-ring (simplified and still work
Sweep the embryo title:
The main cooling ring
On-site tower assembly. Ring baking spot
D:a1500
Present square tower assembly clothing broken seam
Head seal now between the plate ring sediment
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