GB/T 41110-2021Tubular cored electrodes for gas shielded and non-gas shielded metal arc welding of nickel and nickel alloys (English PDF)

4.1 Classification of models

The models of welding wires are divided according to the chemical composition of the deposited metal, the type of flux core, the type of shielding gas and the welding position. See

4.2 Formulation method of model

The model of welding wire consists of five parts:

a) Part I: Use the letter "T" to indicate flux-cored wire;

b) Part II: Use "Ni" plus 4 digits to indicate the numerical code of the chemical composition classification of nickel-based deposited metal, see 5.2; where the code indicating the main type of added alloy (deposited metal category) is:

1) 4xxx means nickel-copper alloy;

2) 6xxx means nickel-chromium alloys, including nickel-chromium, nickel-chromium-iron, nickel-chromium-molybdenum and nickel-chromium-cobalt-molybdenum alloys with an iron content of no more than 25%;

3) 10xx means nickel-molybdenum alloy with a small amount of chromium;

4) Other numbers indicate nickel alloys containing other specific elements;

6 Test Methods

6.1 Dimension and surface quality

6.1.1 Dimension The measuring tool with an accuracy of 0.01mm shall be used for the inspection of the diameter of the welding wire; and shall be measured at the same position in the direction perpendicular to each other; and the measurement positions shall not be less than two.

6.1.2 Surface quality The surface quality of the welding wire shall be visually inspected at any part of the welding wire according to the provisions of GB/T 25775.

6.2 Chemical analysis

6.2.1 The samples for chemical composition analysis of deposited metal shall be prepared according to the provisions of GB/T 25777 and Table 5; and can also be prepared on the mechanical properties test piece or on the pull rod after breaking. During the arbitration test, It shall be carried out according to the provisions of GB/T 25777 and Table 5.

6.2.2 Any suitable analytical method may be used for chemical composition analysis. The arbitration test shall be carried out according to the analysis method confirmed by both parties.

6.3 Mechanical property test

6.3.1 Base metal for test For the base metal used for the mechanical property test of the deposited metal, nickel and nickel alloys with the same chemical composition as the deposited metal shall be used. If other base metals are used, the test welding consumables or other equivalent welding consumables shall be used to weld the isolation layer on the groove surface and the backing plate surface, and the thickness of the isolation layer shall be no less than 3mm after processing.

6.3.2 Preparation of specimen

6.3.2.1 The test piece for the mechanical properties of the deposited metal shall be prepared according to GB/T 25774.1; the test piece type 1.3 shall be used; the width of the test plate shall be no less than 125mm; and the welding wire of dia. 1.2mm shall be used for welding; or the welding wire of other specifications shall be agreed between the supplier and the purchaser.

Welding parameters are recommended by the manufacturer. The control requirements for the type of test piece, the number of welding passes and the number of layers shall be as specified in Table 6.