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US 11,453,079 B2Granted
Multi-electrode submerged arc welding method
AssigneeJfe Steel Corporation
InventorsAtsushi Ishigami, Naoya Hayakawa
Life of this patent
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Abstract
A multi-electrode submerged arc welding method enables, in multi-electrode submerged arc welding using five or six electrodes, a deep penetration and a large amount of deposit metal to be obtained by supplying a large current, and enables stable arc to be generated by respective electrodes by suppressing magnetic interference. Welding defects can be prevented, beads with a good shape or appearance can be obtained, and the welding speed can be increased.
Claims4
A multi-electrode submerged arc welding method of butt welding of a thick steel plate by using multiple electrodes, wherein a thickness of the thick steel plate is 15 to 45 mm and the multiple electrodes consists of five electrodes, the method comprising:
- disposing, in a welding advance direction, a first electrode at a selected position, a second electrode behind and adjacent to the first electrode, a third electrode behind and adjacent to the second electrode, a fourth electrode behind and adjacent to the third electrode, and a fifth electrode behind and adjacent to the fourth electrode;
- and
- supplying first to fifth welding currents to the first to fifth electrodes such that a current density J1 (A/mm2) of the first electrode, a current density J2 (A/mm2) of the second electrode, a current density J3 (A/mm2) of the third electrode, a current density J4 (A/mm2) of the fourth electrode, a current density J5 (A/mm2) of the fifth electrode satisfy Formulae (6) to (9), an arc voltage of the first electrode E1 (V) and an arc voltage of the second electrode E2 (V) satisfy Formula (13), and a difference between a maximum bead width and a minimum bead width in an obtained welding joint is 2.5 mm or less in a length of 1000 mm of a steady region of the obtained welding joint, wherein:
- a distance L12 (mm), a distance L23 (mm), a distance L34 (mm), and a distance L45 (mm) satisfy Formulae (1) to (4), the distance L12 being a distance between a position where a welding wire of the first electrode is in contact with a surface of the thick steel plate and a position where a welding wire of the second electrode is in contact with the surface of the thick steel plate, the distance L23 being a distance between the position where the welding wire of the second electrode is in contact with the surface of the thick steel plate and a position where a welding wire of the third electrode is in contact with the surface of the thick steel plate, the distance L34 being a distance between the position where the welding wire of the third electrode is in contact with the surface of the thick steel plate and a position where a welding wire of the fourth electrode is in contact with the surface of the thick steel plate, and the distance L45 being a distance between the position where the welding wire of the fourth electrode is in contact with the surface of the thick steel plate and a position where a welding wire of the fifth electrode is in contact with the surface of the thick steel plate;
- a total welding current of the five electrodes is 4000 to 6000 A;
- the welding wire of the first electrode is provided perpendicular or tilted at a backsweep angle with respect to the thick steel plate;
- and
- alternating currents are supplied as welding currents to the second to fifth electrodes,
- 12 mm≤L12≤25 mm (1)
- 12 mm≤L23≤25 mm (2)
- 12 mm≤L34≤25 mm (3)
- 12 mm≤L45≤25 mm (4)
- 0.40≤J2/J1≤0.95 (6)
- 0.60≤J3/J2≤0.95 (7)
- 0.60≤J4/J3≤1.00 (8)
- 0.60≤J5/J4≤1.00 (9)
- 0≤E2−E1≤2 (13).
14 more elements
A multi-electrode submerged arc welding method of butt welding of a thick steel plate by using multiple electrodes, wherein a thickness of the thick steel plate is 15 to 45 mm and the multiple electrodes consists of six electrodes, the method comprising:
- disposing, in a welding advance direction, a first electrode at a front, a second electrode behind and adjacent to the first electrode, a third electrode behind and adjacent to the second electrode, a fourth electrode behind and adjacent to the third electrode, a fifth electrode behind and adjacent to the fourth electrode, and a sixth electrode behind and adjacent to the fifth electrode;
- and
- supplying a first to sixth welding currents to the first to sixth electrodes such that a current density J1 (A/mm2) of the first electrode, a current density J2 (A/mm2) of the second electrode, a current density J3 (A/mm2) of the third electrode, a current density J4 (A/mm2) of the fourth electrode, a current density J5 (A/mm2) of the fifth electrode, and a current density J6 (A/mm2) of the sixth electrode satisfy Formulas (6) to (10), an arc voltage of the first electrode E1 (V) and an arc voltage of the second electrode E2 (V) satisfy the following Formula (13), and a difference between a maximum bead width and a minimum bead width in an obtained welding joint is 2.5 mm or less in a length of 1000 mm of a steady region of the obtained welding joint, wherein:
- a distance L12 (mm), a distance L23 (mm), a distance L34 (mm), a distance L45 (mm), and a distance L56 (mm) satisfy Formulas (1) to (5), the distance L12 being a distance between a position where a welding wire of the first electrode is in contact with a surface of the thick steel plate and a position where a welding wire of the second electrode is in contact with the surface of the thick steel plate, the distance L23 being a distance between the position where the welding wire of the second electrode is in contact with the surface of the thick steel plate and a position where a welding wire of the third electrode is in contact with the surface of the thick steel plate, the distance L34 being a distance between the position where the welding wire of the third electrode is in contact with the surface of the thick steel plate and a position where a welding wire of the fourth electrode is in contact with the surface of the thick steel plate, the distance L45 being a distance between the position where the welding wire of the fourth electrode is in contact with the surface of the thick steel plate and a position where a welding wire of the fifth electrode is in contact with the surface of the thick steel plate, and the distance L56 (mm) being a distance between the position where the welding wire of the fifth electrode is in contact with the surface of the thick steel plate and a position where a welding wire of the sixth electrode is in contact with the surface of the thick steel plate;
- a total welding current of the six electrodes is 4000 to 6000 A;
- the welding wire of the first electrode is provided perpendicular or tilted at a backsweep angle with respect to the thick steel plate;
- and
- an alternating current is supplied as a welding current to the second to sixth electrodes,
- 12 mm≤L12≤25 mm (1)
- 12 mm≤L23≤25 mm (2)
- 12 mm≤L34≤25 mm (3)
- 12 mm≤L45≤25 mm (4)
- 12 mm≤L56≤25 mm (5)
- 0.40≤J2/J1≤0.95 (6)
- 0.60≤J3/J2≤0.95 (7)
- 0.60≤J4/J3≤1.00 (8)
- 0.60≤J5/J4≤1.00 (9)
- 0.60≤J6/J5≤1.00 (10)
- 0≤E2−E1≤2 (13).
16 more elements
Dependencies are inferred from the claim text.