NB/T 47018.7-2022Technical conditions for ordering welding materials for pressure equipment - Part 7: Titanium and titanium alloy welding wires and filler wires (English PDF)

4.4 The transverse metallographic inspection (macrostructure) results of titanium and titanium

alloy welding wires and filler wires shall be free of cracks, folds, pores, delamination, shrinkage,

metal or non-metal inclusions and other defects that affect use.

4.5 The surface of titanium and titanium alloy welding wires and filler wires shall be clean and

smooth, free of burrs, depressions, scratches, scales, folds and other defects that affect use; and

free of contamination by lubricants and other foreign substances.

4.6 After the weld metal longitudinal bending specimen is bent to the specified angle, there

shall be no single opening defect with a length greater than 3 mm in any direction along the

inner edge of the weld metal on the tensile surface. The corner opening defects of the specimen

weld metal can be ignored; but the length of the corner opening defects caused by un-fusion,

slag inclusions or other internal imperfections shall be included.

5.1 The chemical composition analysis specimens of titanium and titanium alloy welding wires

and filler wires shall be taken as finished product analysis; and the arbitration test shall be

carried out in accordance with the provisions of GB/T 4698 (all parts).

5.2 The size inspection of titanium and titanium alloy welding wire and filler wire shall be

measured with a measuring tool with an accuracy of 0.01 mm.

5.3 The metallographic inspection (macrostructure) of titanium and titanium alloy welding wire

and filler wire shall be carried out in accordance with the provisions of GB/T 5168. When the

transverse metallographic inspection (macrostructure) finds that the welding wire or filler wire

has unnecessary defects, the welding wire or filler wire with typical defects can be sampled for

radiographic test.

5.4 The surface and macroscopic quality inspection of titanium and titanium alloy welding wire

and filler wire shall be visually inspected.

5.5 Radiographic test and bending performance inspection of weld metal

5.5.1 Preparation of test pieces

welding wire and filler wire.

6.2.2 Take 2 coils (or pieces) of each batch of welding wire and filler wire at random; and

respectively take 1 specimen at each end of each piece for transverse metallographic inspection

(macrostructure).

6.2.3 The size, surface and macroscopic quality of welding wire and filler wire shall be

inspected piece/coil by piece/coil.

7.1 The welding wire is supplied in the form of welding wire coils and welding wire reels with

internal support; and the filler wire is supplied in the form of coils, reels or straight bars with

internal support. The welding wire can also be supplied in other forms after the supplier and the

purchaser agree.

7.2 The welding wire and the filler wire shall meet the requirements of continuous feeding in

automatic or semi-automatic welding equipment.

7.3 The welding wire of each welding wire coil and welding wire reel shall be a continuous

length of welding wire of the same furnace number. The winding of the welding wire is not

allowed to have sharp bends, kinks, waves, embedding, overlaps; and can be unwound freely

without hindrance. The outer end of the welding wire shall be fixed and marked, which is

obvious and easy to find.

7.4 When the welding wire has a joint, it shall be properly processed so as not to affect its

uniform and continuous feeding in the welding equipment.

8.1 The inner packaging of welding wire and filler wire shall be kept dry, free from

environmental pollution and prevent rust.

8.2 The outer packaging of welding wire and filler wire shall be protected from damage during

transportation and storage.

9.1 The inner and outer packaging, instruction manual and quality certificates of welding wire

and filler wire manufactured in accordance with the provisions of this Document shall be

marked with the words "Titanium and titanium alloy welding wire (filler wire) for pressure

equipment" and the product identification "NB/T 47018". The product identification shall also

be printed on the inner packaging label.

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