This standard specifies the basic requirements for the qualification of fusion welding procedures for steel welded structures. JB/T 6963-1993 Qualification of fusion welding process for steel parts JB/T6963-1993 Standard download and decompression password: www.bzxz.net

Machinery Industry Standards of the People's Republic of China
Qualification of fusion welding procedures for steel parts
1 Subject content and scope of application
This standard specifies the basic requirements for qualification of fusion welding procedures for steel welded structures. This standard is applicable to all steel explosion-jointed structures with quality requirements. 2 Reference standards
GB699
Technical conditions for high-quality carbon structural steel
Technical conditions for ordinary carbon structural steel
GB700
GB 711||tt| |GB713
GB912
GB979
GB 983
High-quality carbon structural steel hot-rolled thick steel plate and wide steel strip carbon steel and low alloy steel plate for boilers| |tt||Technical conditions for ordinary carbon structural steel and low alloy structural steel thin steel plates Carbon cable steel casting classification and technical conditions
Stainless steel welding rods
GB1220
Stainless steel rods||tt| |GB 1591
GB 2100
GB3531
GB4172
GB4237
GB 4238
GB 5117
GB 5118| |tt||GB5310
GB 6479
GB6654
GB6967
Technical conditions for low alloy structural steel
Technical conditions for stainless acid-resistant steel castings||tt ||Technical Conditions of Low Alloy Steel Thick Steel Plate for Low Temperature Pressure Vessels Weathering Steel for Welded Structures
Stainless Steel Hot Rolled Steel Plate
Heat Resistant Steel Plate
Carbon Steel Welding Rod
Low Alloy Steel welding rods
Seamless steel pipes for high-pressure boilers
High-pressure seamless steel pipes for fertilizer equipment
Carbon steel and low alloy steel thick steel plates for pressure vessels Medium and high-strength stainless steel for engineering structures Technical conditions for castings, pressure vessels and forgings
JB755
JB2640 Technical conditions for pressure-bearing steel castings of boiler pipe accessories 3 General provisions
JB/T 6963--93
3.1 Engaged in welding The structural manufacturer shall conduct welding process assessment in accordance with the provisions of this standard and relevant industry standards, and use the qualified assessment records as the basis for the preparation of welding process specifications. 3.2 The welding procedure qualification must be carried out in the manufacturer, and the welding procedure specifications compiled are only applicable to the manufacturer. 3.3 The format of the welding procedure qualification record and welding procedure specification can be determined by the relevant department or manufacturer, but the main factors affecting the quality of the welded parts, additional main factors (referring to when the joint performance has impact toughness requirements) and secondary factors must be indicated. The Ministry of Machinery Industry of the People's Republic of China approved the implementation on 1994-07-01 on 1993-07-27
257
JB/T 6963--93
3.4·When changing the welding method, all Re-qualify the welding procedure. Basic content
4
4.1 Base material
The base material used for process evaluation should be the same as the product. In order to reduce the repetitive workload of process assessment, the base material is divided into different categories and a group of numbers according to chemical composition, mechanical properties, etc. 4.1.1
(see Table 1). Under the same conditions of other main factors (and additional main factors), the process qualification of a certain steel can represent the process qualification of other steels in the same type and group number. 4.1.2 The welding process of dissimilar materials between steels of different types and group numbers. The assessment must be carried out using a combination of steel materials of the corresponding category number. Even though the welding process assessment of each group of steel materials has passed, the process assessment of the combination must still be carried out. 4.1.3 For steel materials of P1, P3, P4, and P5 categories, except that the welding method is small hole effect plasma arc welding, they have passed the process assessment of the higher category number itself, and other major factors (and additional major factors) Under the same conditions, it can represent the process evaluation between steel materials of this group number and steel materials of lower group numbers.
4.1.4 For low alloy steel and medium alloy steel not listed in the classification range of Table 1, process evaluation should be carried out separately. Table 1
Base material
Class group number
P1-1
P1-2
P1-3
P2-2| |tt||P2-3
P2-4
258
Type of base material
Carbon steel, carbon manganese steel
dn min ≤481 MPa
Carbon steel, carbon manganese steel
Gh min =: 481~ 549 MPa
Carbon steel, carbon manganese steelbZxz.net
0b min>549~618 MPa||tt ||Quenched and tempered carbon steel, carbon manganese steel
Ob min 549 MPa
Quenched and tempered carbon steel, carbon manganese steel
dp min-=549-618 MPa||tt ||Quenched and tempered carbon steel, carbon manganese steel
618MPa
Examples of steel grades
Q235(GB 700,GB 912)
10,20,25(GB 699)
20R(GB 6654)
20g,22g(GB 713)
20G(GB 5310)
1 12MnCuCr(GB 4172)
12Mng-16Mng(GB 713)
ZG25(GB 979)
16Mng(GB 713)
15MnVg(GB 713)
09Mn2V(JB 755)||tt ||Q255(GB 700)
35(GB711)
ZG20SiMn,ZG35(GB979)
15MnCuCr(GB 4172)
15MnTi(GB 1591)||tt ||Q275(GB 700)
45(GB711)
15MnVNR (GB 6654)
16MnDR(GB3531)
06MnNbDR(GB 3531)
09Mn2VDR(JB 755). (GB 3531)
15MnCuCr-
-QT(GB 4172)
Material
Mother
Class group number|| tt||P3-1
P3-2
P3-3
P4-1
P4-2
P4-3||tt| |P5-1
P5-2
P5-3
P6
P7
P8-1
Type of base material|| tt||Molybdenum steel, manganese molybdenum steel, chromium molybdenum steel
Cr<1% .Mo<1%
dh min481 MPa
Aluminum steel, manganese molybdenum steel, chromium molybdenum steel
Cr<1%.M0<1%
min = 481~549 MPa
Aluminum steel, manganese molybdenum steel, chromium molybdenum steel
Cr<1%. Mo<1%
Ob nin≥549--618 MPa
Low alloy steel
Cr(1~2)%,M0>0. 5%
Cb min481 MPa
Low alloy steel
Cr(1 ~2) % ??,Mo≥0. 5%
ob mia = 481-- 549 MPa
Low alloy steel
Cr(1-2)%,M0≥0. 5%
Chmn>549~618 MPal
2%
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