Gate valve raw material stainless steel plate welding rod

Gate valve raw material stainless steel plate welding rod

This standard stainless steel plate welding rod specification classification, technical standards, testing methods and testing standards and other related information. This standard applies to stainless steel electrode for arc welding. Such electrode cladding metal should contain more than 10.50% chromium and more iron than any element. According to the composition of fused metal, type of welding core, welding position and type of welding current, the welding rod should not have defects such as cracks, bubbles, residue and falling off that harm weld quality, as shown in Table 1 and Table 2.
1. Theme idea and application field
This standard stainless steel plate welding rod specification classification, technical standards, testing methods and testing standards and other related information.
This standard applies to stainless steel electrode for arc welding. Such electrode cladding metal should contain more than 10.50% chromium and more iron than any element.
2 Reference Standards
GB223.1~223.70 Methods for chemical analysis of steel and aluminum alloys
GB1954 – Measurement of microstructure content in welding of chrome-nickel low alloy steel
GB2652 Tensile test method for welding and cladding metal
GB 4334.5 Stainless steel plates — corrosion test method for sodium thiosulfate hydrochloride
3 Type and specification classification
3.1 The type and specification of the welding rod shall be divided according to the composition of the fused metal, the type of welding core, the welding position and the type of welding current.
3.2 Model Specification preparation method
The letter “E” indicates the electrode, and the number after “E” represents the classification number of the molten metal component. If there is a special requirement for the component, the component is indicated by the chemical element symbol after the number. The two numbers after the “one” represent the type of electrode core, welding position and welding current type.
3.3 Examples of welding rod specifications in this standard are as follows:
④E502, E505, E7Cr, E5Mo, E9Mo type electrode will be put into the next modified GB5118 “high alloy Steel electrode” standard, but deleted from this standard.
⑤ The suffix one XX. Indicates one 15, one 16, one 17, one 25 or one 26.
Note: Full-position welding is not recommended for electrodes with diameters equal to and greater than 5.0mm.
4 Technical Standards
4.1 Specifications
4.1.1 Electrode specifications shall meet the requirements in Table 3.
4.1.1.1 Allow the manufacture of 3.0mm aperture electrode instead of 3.2 electrode and 5.8mm aperture electrode instead of 6.0rnm electrode.
4.1.1.2 Welding rods of other specifications are allowed to be supplied according to the agreement between Party A and Party B.
4.1.2 The length of the clamping end of the electrode shall meet the requirements in Table 4.
Table 4 Length of clamping end
4.2 Welding Core
4.2.1 There should be no cracks, bubbles, residue and falling off in the welding core of the electrode that harm the quality of the weld.
4.2.2 The welding core at the arc starting end of the electrode should be rounded, and the welding core port should be exposed to ensure that the arc starting is convenient. The exposed core of the electrode should meet the following requirements:
a. The outer diameter of the electrode shall not exceed 2.0 mm, and the length of the exposed core shall not exceed 1.6mm
b. The diameter of the electrode is 2.5mm and 3.2mm, and the length of the exposed core should not be greater than 2.0mm along the length Angle
c. The diameter of the electrode exceeds 3.2mm, and the length of the exposed core along the length Angle should not be greater than 3.2mm
d. All kinds of electrode aperture along the Angle of the circle should not be more than half of the circle.
4.2.3 The core of the electrode shall have sufficient compressive strength to avoid destruction in conventional transportation or use.
4.2.4 Electrode eccentricity shall meet the following requirements:
a. The outer diameter of the electrode shall not exceed 2.5rnm, and the eccentricity shall not exceed 7%;
b. Diameter of 3.2mm and 4.0mm electrode, eccentricity should not be greater than 5%;
c. The aperture of the electrode shall not be less than 5.0mm, and the eccentricity shall not be greater than 4%.
The calculation method of eccentricity is shown as follows (Figure 1).
In the formula :T1 — welding rod cross section coating layer ** large thin thick weld core aperture
T2 — small thin and thick weld core aperture of the same cross section epidermal layer
4.3 T-joint weld
4.3.1 The weld surface shall be inspected by human eyes without cracks, welding scars, welding burls and surface air holes.
4.3.2 The cross section of the weld shall meet the following requirements after polishing and etching:
a, each side weld shall be fused to or through the two plate junction;
b. Foot size of each side weld and the difference between the length of two welding holes should conform to the specifications in Table 5 (as shown in Figure 2).
c. The convexity of each profile weld shall meet the requirements in Figure 3.
d. Check by human eyes, there should be no cracks in the cross section of the weld.
e. No welding burls or air holes.
4.4 Molten metal composition
The chemical composition of cautery metal shall conform to the requirements of Table 1.
4.5 Physical properties of metal cladding
The tensile test results of fused metal should conform to the requirements in Table 6.
Table 6 Physical properties of metal cladding
Precipitation hardening is resolved, followed by air cooling to room temperature.
f. The sample is insulated at 740~760℃ for 4 h, followed by air cooling.
g. The sample was insulated at 730~750℃ for 4 h, followed by air cooling.
4.6 Corrosion resistance of fused metal
The corrosion resistance test of fused metal shall be specified by the agreement of both parties.
4.7 Metallographic structure content of fused metal
The ferritic content of fused metal shall be specified in the agreement between Party A and Party B.
Stainless steel plate electrode for gate valve raw materials (2) The test of the electrode standard of each type and specification shall conform to the requirements of Table 7. Before the experiment, the electrode should be baked in accordance with the drying temperature introduced by the manufacturer. Suitable for communication AC or DC welding electrode experiment to choose communication AC. The base material used for chemical composition analysis may be carbon steel, high alloy steel or stainless steel plate. The carbon content of the fused metal shall not exceed 0.04% of the electrode and the base material used for chemical composition analysis of the E63O electrode has a very high carbon content of 0.03%. In accordance with the provisions of Article 5.4.3, the base material with a very high carbon content of 0.25% can also be used. Base metal for chemical composition analysis of electrode is very high carbon content of 0.25%…
Connecting: Stainless steel plate welding rod for gate valve raw material (1)
5 Test Method
5.1 The test of the electrode standard of each type and specification shall comply with the requirements in Table 7. Before the experiment, the electrode should be baked in accordance with the drying temperature introduced by the manufacturer. Suitable for communication AC or DC welding electrode experiment to choose communication AC.
Table 7 Experimental regulations
5.2 Base material for experiment
5.2.1 Base material for T-joint weld test is specified as follows:
Austenitic type and E630 type welding rod should use stainless steel plate with fused metal composition, or 0Cr19Ni9 or OCr19Ni9Ti thick plate.
B.410,E410IiNMo E430 type electrode shall be OCr13, or 1Cr13 type stainless steel plate.
c. Other types of welding rods should be made of heat-resistant steel plates or carbon steel or low-alloy steel plates with the same composition as the fused metal.
5.2.2 The base material used for chemical composition analysis may be carbon steel, high alloy steel or stainless steel plate. The carbon content of the fused metal shall not exceed 0.04% of the electrode and the base material used for chemical composition analysis of the E63O electrode has a very high carbon content of 0.03%. In accordance with the provisions of Article 5.4.3, the base material with a very high carbon content of 0.25% can also be used. All other models and specifications of the electrode chemical composition analysis with a very high carbon content of 0.25% base metal