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Machinery Industry Standard of the People's Republic of China
Extra-fine carbon steel welding rodsWww.bzxZ.net
1 Subject content and scope of application
JB/T 6964-- 93
This standard specifies the diameter of the welding rod It is the model, technical requirements, test methods and inspection rules of 0.6~1.6mm extra-fine carbon steel electrodes.
This standard applies to coated electrodes (hereinafter referred to as electrodes) used for welding carbon steel thin steel plates. 2 Reference standards
GB223.1~223.24 Chemical analysis methods for steel and alloys GB228 Metal tensile test methods
GB700 carbon structural steel
Welded joint bending and flattening test methods|| tt || GB2653 | Table 1
Welding rod model division
type
E4301-S
E4303-S
E4311-S
E4313-S|| tt||E4300-S
Coated skin type
ilmenite type
calcium titanium type
high fiber potassium type
high titanium type|| tt||Special type
Note, ①The meaning of the welding position symbols is as follows: F--flat welding; V-vertical welding, H-horizontal welding or horizontal fillet welding: O-overhead welding. ②The symbol meanings of current types are as follows:
ac AC AC SDC (±) DC reverse connection or forward connection. 3.2 Welding rod model preparation method
3.2.1 The first two digits after the letter "E\ means welding rod.
Welding position
FV, HO
3.2.2E" Indicates the minimum tensile strength of the deposited metal. Current type
ac or dc(±)
3.2.3 The third digit indicates the welding position of the electrode, "0" and "1\" indicate that the electrode is suitable for all-position welding (flat welding, vertical welding) Welding, overhead welding, horizontal coal).
3.2.4 The combination of the third and fourth digits indicates the type of welding current and coating type. 3.2.5 The suffix letter S indicates extra-fine electrodes, and the short Mark "_" to separate it from the previous number. Approved by the Ministry of Machinery Industry of the People's Republic of China on 1993-07-27
1994-07-01 Implementation
4 Technical Requirements
4.1 Dimensions|| tt||4.1.1 The size of the welding rod should comply with the requirements in Table 2. ||1.4.1.6
Welding rod clamping end
4.2
Diameter
The length of the welding rod clamping end shall comply with the requirements of Table 3
Bar| |tt||Diameter
Straight
0. 6,0.8.1. 0.1. 2
1.4, 1.6
JB/T 6964-93||tt| |Table 2 Welding rod size
Limit deviation
±0.05
Welding
Bar
Basic ruler
200~~250||tt ||250~300
Table 3
Welding rod clamping end length
Lai
Basic ruler
12
15||tt ||hold
end
length
degree
degree
mm
limit deviation
±2.0||tt ||mm
Limit deviation
±5.0
4.3 Coating
4.3.1 The electrode coating should be evenly and tightly wrapped around the welding core, and the entire The coating of the root electrode should not have defects such as cracks, bubbles, impurities, and peeling that would affect the welding quality.
4.3.2 The core end face of the lead end of the welding rod should be exposed to ensure easy arc ignition along the length. The length of the exposed core should not be greater than the diameter of the welding core. 4.3.3. The electrode coating should have sufficient strength to prevent damage during normal handling or use. 4.3.4 The diameter of the electrode eccentricity
is 0.6.0.8. For 1.0, 1.2, 1.4, and 1.6mm electrodes, the eccentricity should not be greater than 5%. The eccentricity calculation method is shown in Figure 1 and formula (1): Figure 1
T,-T2
Eccentricity -
Minimum thickness + welding core diameter. 4.4 Chemical composition of the molten metal
The chemical composition of the deposited metal shall comply with the requirements in Table 4. (1)
537
Coal
Bar
Type
E4301-S.F4303-S
E4311-S,E4313- S
E4300-S
4.5 Mechanical properties
No.
JB/T 6964---93
Qiu 4
4.5. 1 The tensile strength of welded joints should comply with the requirements in Table 5. Chemical composition of deposited metal
Mn
Table 5 Tensile strength
Explosion
Strip
Type
E4301-S,E4303- S
No.
F4311-S,F4313-S
E4300-S
MPa
120
Resistant
Si
pull
o.04
degree
P
e.0.04
(kg *f/mm2)||tt || (.43)
4.5.2 The longitudinal cold bending angle of the welded joint should reach 180°, and the tensile surface of the sample weld and heat-affected zone shall not have cracks with a length exceeding 3 mm, and the length shall not exceed 3 mm. No more than 3 cracks are allowed, but cracks with a length of no more than 0.4mm and cracks on the edges and corners of the sample are not used as a basis for rejection.
4.6 Welding process performance
4.6.1 When welding tide plates, in order to make the surface beautiful and the joint performance good, there must be appropriate penetration. 4.6.2 The arc must be easy to strike and the arc must be stable. 4.6.3 There must be no cracks, pores or other defects on the surface of the weld when visually observed. 5 Test method
5.1 Base material for test
The test plate material for the test should be Q235 steel specified in GB700 or other low carbon steel sheets with chemical composition and mechanical properties equivalent to the welding rod deposited metal .
5.2 Test electrodes
The test electrodes can be used in the supplied state, or they can be dried according to the drying specifications recommended by the manufacturer. 5.3 Chemical analysis of deposited metal
5.3.1 The test piece for chemical analysis of deposited metal should be in the flat welding position and welded with alternating current. 5.3.2 The test piece for chemical analysis of deposited metal should be multi-layer surfacing, each welding After completing a pass, foreign matter on the surface of the weld bead should be removed. The minimum size and sampling location of cladding gold chips should comply with the requirements in Table 6.
Table 6 Melt number Metal chemical analysis sampling position
Welding rod diameter
0.6.0.8.1.0.1. 2
1.4, 1. 6
Minimum size of brazing metal
15×15×10
20×20×12
Minimum distance between sampling position and substrate surface
Minimum distance
4|| tt||6
mm
5.3.3 The chemical analysis test of the deposited metal may adopt any appropriate method agreed upon by both the supplier and the buyer. The arbitration test shall be conducted in accordance with the provisions of GB223.
5.4 Joint tensile test
5.4.1 Joint tensile test specimen size, assembly and welding and sampling diagram are shown in Figure 2. 538
JB/T6964--93||tt ||5.4.2 When assembling and welding the test piece, first assemble the two test plates (150mm×100mm×2mm) as specified in Figure 2, and fix the two ends of the gap with positioning welding spots. Use insulation material with a thickness of 10mm or more to keep it warm from the workbench. The specimen was then gastically welded in a flat welding position at room temperature. After welding, the welding seam on the other side should be air-cooled on the insulating material until the temperature of the specimen reaches 100°C, and then the weld on the other side should be air-cooled on the insulating material until the chamber overflows. 5.4.3 As shown in Figure 2, use mechanical processing to cut two tensile specimens (see Figure 3). And process the weld reinforcement to be flush with the base metal. Rashen
Rashen
200
Sample
Sample
Figure 2 Joint tensile test piece size, assembly and welding and sampling diagram R1± 0.1
200
Figure 3 Tensile specimen
5.4.4 Determine the tensile properties of the joint according to the provisions of GB228. 5.5 Bending test
5.5.1 The bending test is carried out using the longitudinal bending specimen of the weld. The size, assembly and welding and sampling instructions of the test specimen are shown in Figure 4. 5.5.2 The order of assembly and welding of the specimen is the same as that specified in 5.4.2. 5.5.3 Cut two bending specimens using the mechanical processing method as shown in Figure 4, one for forward bending and one for back bending. The weld reinforcement of the bending specimen is not processed.
5.5.4 Weld bending test shall be carried out in accordance with GB2653 (D=4a). 539
5.6 Process test
JB/T6964—93
200
2
Figure 4 Schematic diagram of bending specimen size, assembly, welding and sampling 5.6 .1 The specifications of the welding rods used in the process test, the dimensions of the test piece and the welding position are shown in Table 7 and Figure 5. Table 7 Process test specimen dimensions
Test
Welding
Strip
Type
E4301-S
E4303-S|| tt||E4311-S
E4313-S
E4300-S
540
in specifications
1.2
1.4||tt ||1.6
Thickness t
2.0
Trial
pieces
Width W
200
R||tt ||Width W2
100
mm
Length L
150
Flat fillet welding position
JB/T 6964--93| |tt||Flat welding position
Figure 5 Dimensions and welding position of process test piece Figure 5.6.2 Welding process test piece is welded at room temperature. a.
The flat welding position (F) adopts single-sided butt welding;
The ice flat fillet welding (H) adopts single-sided fillet welding;
b.
C| |tt||Vertical welding position
Vertical fillet welding (V) generally uses vertical upward welding, but if the manufacturing instructions allow vertical downward welding, vertical downward welding should be used. 6 Inspection Rules
Finished welding rods are inspected by batch by the manufacturing technology inspection department. 6.1 Each batch of welding rods is made from the same batch number of welding cores, the same batch number of main coating raw materials, and the same coating formula and manufacturing process. The maximum quantity per batch is 3t.
6.2 Welding rod sampling method
When inspecting each batch of welding rods, take an average of representative samples from at least two locations according to the required quantity. 6.3 Acceptance
6.3.1 The electrode size, electrode clamping end and coating inspection results of each batch of electrodes shall comply with the provisions of 4.1, 4.2 and 4.3. 6.3.2 The inspection results of the chemical composition of the deposited metal of each batch of welding rods shall comply with the provisions of Article 4.1. 6.3.3 The mechanical property inspection results of each batch of welding rods shall comply with the provisions of Article 4.5. When ensuring compliance with the provisions of Article 4.5, the mechanical properties may not be inspected on a batch basis.
6.3.4 The process performance inspection results of each batch of welding rods shall comply with the provisions of 4.6 and 6.4 re-inspection
If any inspection fails, the inspection shall be doubled and re-inspected, and the sample may be Intercept after re-welding the test piece as required. The results of double re-inspection shall comply with the regulations for this inspection.
541
7 Marks, Packaging, Transportation, Storage and Quality Certificate 7.1 Marks
JB/T 6964--93
The outside of each package and box of welding rods should Mark the following: a.
b.
d.
label, electrode model or electrode grade;
specification and net weight or number of rods;||tt| |Production batch number and inspection number:
Manufacturer name and trademark
Packaging, transportation, storage
7.2
7.2.1 Welding rod according to 0.5, 1, 2, 2.5 kg net weight, or according to the corresponding number of rods as one package, the package should be sealed. 7.2.2 Welding rods should be packed in a certain number of packages. Welding rod packaging materials and boxes should be strong and durable to ensure that the packaging is not damaged during transportation, handling and normal storage. The net weight of each box of welding rods can be 2, 5.10.20 and 25kg. 7.3 Quality Certificate
The manufacturer should issue a quality certificate for each batch of welding rods based on the actual inspection results for the convenience of both supply and demand parties. When the user makes a request. The manufacturer shall provide a copy of the inspection results. Additional notes:
This standard is proposed and managed by the Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard is jointly drafted by the Harbin Welding Research Institute of the Ministry of Machinery Industry and Jinhua Welding Equipment Materials Factory. The drafters of this standard are Li Deshan and Ni Xueban. 542
Serial number, welding rod model or welding rod grade;
Specifications and net weight or number of rods;
Production batch number and inspection number:
Manufacturer name and trademark||tt| |Packaging, transportation, storage
7.2
7.2.1 Welding rods shall be packed in a net weight of 0.5, 1, 2, 2.5kg, or according to the corresponding number of rods, and the packaging shall be sealed. 7.2.2 Welding rods shall be packed in - Packing in a certain number of packages. Welding rod packaging materials and boxes should be strong and durable to ensure that the packaging is not damaged during transportation, handling and normal storage. The net weight of each box of welding rods can be 2, 5.10.20 and 25kg. 7.3 Quality Certificate
For each batch of welding rods, the manufacturer should issue a quality certificate based on the actual inspection results for the convenience of both supply and demand parties. When the user makes a request. The manufacturer shall provide a copy of the inspection results. Additional notes:
This standard is proposed and administered by the Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard is jointly drafted by the Harbin Welding Research Institute of the Ministry of Machinery Industry and Jinhua Welding Equipment Materials Factory. The drafters of this standard are Li Deshan and Ni Xueban. 542
Serial number, welding rod model or welding rod grade;
Specifications and net weight or number of rods;
Production batch number and inspection number:
Manufacturer name and trademark||tt| |Packaging, transportation, storage
7.2
7.2.1 Welding rods shall be packed in a net weight of 0.5, 1, 2, 2.5kg, or according to the corresponding number of rods, and the packaging shall be sealed. 7.2.2 Welding rods shall be packed in - Packing in a certain number of packages. Welding rod packaging materials and boxes should be strong and durable to ensure that the packaging is not damaged during transportation, handling and normal storage. The net weight of each box of welding rods can be 2, 5.10.20 and 25kg. 7.3 Quality Certificate
For each batch of welding rods, the manufacturer should issue a quality certificate based on the actual inspection results for the convenience of both supply and demand parties. When the user makes a request. The manufacturer shall provide a copy of the inspection results. Additional notes:
This standard is proposed and administered by the Harbin Welding Research Institute of the Ministry of Machinery Industry. This standard is jointly drafted by the Harbin Welding Research Institute of the Ministry of Machinery Industry and Jinhua Welding Equipment Materials Factory. The drafters of this standard are Li Deshan and Ni Xueban. 542
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