1, Subject Matter and Scope

This standard specifies the type of Stainless Steel Electrode classification, technical requirements, test methods and inspection rules and so on.

This standard applies to manual arc welding of stainless steel electrodes connected with. Such electrodes deposited metal chromium content should be at 10.5%, as the content should be more than any other element.

2, the reference standard

GB223.1-223.70 Methods for chemical analysis of steel and alloy

GB1954 chrome-nickel austenitic stainless steel weld ferrite content measurement

GB2652 deposited metal weld and test methods for tensile stretch

GB4334.5 stainless steel acid - copper sulfate corrosion test

3, Type Classification

3.1 The electrode according to the chemical composition of deposited metal, coating type, welding position and welding current type of model, see Table 1, Table 2.

3.2 Model Methodology

The letter "E" said electrode, "E" behind the numbers indicate chemical composition of deposited metal classification code, if the special requirements of chemical composition, with elements of the chemical behind the symbols on the figures. Dash "-" two digits after the electrode type, welding position and welding current type.

3.3 The standard electrode model example:

E308-15

┬ ┬ └ said electrode for alkaline coating for all-position, using DC reverse polarity welding

│ └ ─ ─ ─ chemical composition of deposited metal, said classification code

└ ─ ─ ─ ─ ─ said electrode

E410-NiMo-26

┬ ┬ ┬ └ that is alkaline or other types of welding rod coating, suitable for flat and horizontal welding position of welding, the use of AC or DC reverse polarity welding

│ │ │

│ │ └ ─ ─ ─ that the deposited metal content of Ni and Mo have special requirements.

│ └ ─ ─ ─ ─ ─ chemical composition of deposited metal, said classification code

└ ─ ─ ─ ─ ─ ─ ─ said electrode

Table 1 Chemical composition of deposited metal (abbreviated)

Table 2 The position of the welding current and welding

Welding electrode welding current location models

EXXX (X) -15 DCRP all position

EXXX (X) -25 welding, horizontal welding

EXXX (X) -16 AC or DC reverse all position

EXXX (X) -17

EXXX (X) -26 welding, horizontal welding

Note: The diameter is equal to and greater than 5.0mm welding either recommended all-position welding.

4, the technical requirements

4.1 Size

4.1.1 electrode size should be consistent with the provisions of Table 3.

Table 3 Electrode Size mm electrode diameter electrode length

Size of the basic limits of deviation of size limit deviations

1.6,2.0-0.08220-260 ± 2.0

2.5230-350

3.2300-460

4.0,5.0,6.0340-460

4.1.1.1 electrode 3.0mm in diameter instead of allowing manufacturing 3.2mm electrode diameter of 5.8mm instead of 6.0mm Welding Electrode .

4.1.1.2 according to the agreement of supply and demand, allowing the supply of other sizes electrodes.

4.1.2 electrode holder with a length of the provisions should be consistent with Table 4.

Table clamping a length of 4 mm

Clamping a length of rod diameter

≤ 4.010-30

≥ 5.020-40

4.2 coating

4.2.1 electrode coating should not affect the quality of welding cracks, bubbles, impurities and defects such as spalling.

4.2.2 arc Welding Rods coating should be chamfered, welding should be exposed core end to ensure easy-to-arc, the electrode exposed core should meet the following requirements:

a. not more than 2.0mm diameter electrode, along the length of the exposed core length should not exceed 1.6mm;

b. 2.5mm and 3.2mm diameter rod, along the length of the exposed core length should not exceed 2.0mm;

c. greater than 3.2mm diameter electrode, along the length of the exposed core length should not exceed 3.2mm;

d. a variety of electrode diameter along the circumferential direction of the exposed core should not be greater than the circumference of the half.

4.2.3 electrode coating should have sufficient strength, not in normal or damaged during handling.

4.2.4 electrode eccentricity should meet the following requirements:

a. not more than 2.5mm diameter electrode, the eccentricity should not exceed 7%;

b. 3.2mm and 4.0mm diameter rod, the eccentricity should not exceed 5%;

c. not less than 5.0mm diameter electrode, the eccentricity should not exceed 4%.

Eccentricity is calculated as follows (see Figure 1):

T1-T2

Electrode eccentricity = ─ ─ ─ ─ ─ × 100%

(T1 + T2) / 2

Where: T1-electrode cross-section maximum thickness of the cortex medicine + welding core diameter;

T2-the same section of minimum thickness of the cortex + welding drug core diameter.

4.3T-joint fillet weld

4.3.1 The visual inspection of fillet weld surface should be free of cracks, Flux Cored Welding Wire, slag and surface porosity.

4.3.2 The polished cross-section of fillet weld, corrosion should meet the following requirements:

a. should be fused to the fillet weld on each side or melt off the intersection of two plates;

b. welding of fillet weld on each side of the foot size and leg length difference between the two welding shall comply with the provisions of Table 5 (see Figure 2).

c. The visual inspection of fillet weld cross-section shall not crack;

d. shall not weld slag and porosity.

Table 5 Size of fillet weld thickness mm diameter welding rod welding position of the maximum length of the foot size of the difference between the two solder pins

3.26.0 welding of 6.4 ≤ 1.6

Horizontal welding, welding Yang 4.8

3.29.0 welding of 9.5 or 13.0

Horizontal welding, welding Yang