Welding method and welding apparatus

Abstract

To provide a welding method and a welding apparatus which can automatically weld diagonal members with each other.SOLUTION: In a welding speed calculation step of calculating a welding speed of a welding torch that performs weaving, a welding method includes: a deposition amount heat gain calculation step of calculating a relation between a deposition amount and a heat gain of a weld material from the following formulae (1) to (2); a remaining lamination number calculation step of calculating a remaining lamination number for each metal layer from the following formulae (3) to (6); an oblique direction welding speed calculation step of calculating the welding speed in the oblique direction by the following formula (7); and a weaving speed calculation step of calculating the first welding speed of the welding torch in the first operation, the second welding speed of the welding torch in the second operation, the third welding speed of the welding torch in the third operation and the fourth welding speed of the welding torch in the fourth operation from the following formulae (8) to (15).SELECTED DRAWING: None

Claims

1. The process involves forming a groove between the end faces of a first member and a second member to be welded together, extending in an oblique direction intersecting a horizontal plane and having a depth direction that is horizontal, and weaving a welding torch that melts the welding material into the groove with a moving means, thereby forming metal layers extending in the oblique and vertical directions with the molten welding material, and stacking the metal layers in the depth direction. The weaving is performed for each of the metal layers, A first movement that proceeds in an upward direction along the end face of the first member, Following the first movement, a second movement is performed, which moves horizontally from the end face of the first member to the end face of the second member, Following the second operation, a third operation proceeds in an upward direction along the end face of the second member, Following the third operation, a fourth operation is performed, which involves gradually moving downward from the end face of the second member to the end face of the first member, and this is repeated in this order. The process includes a welding speed calculation step for calculating the welding speed of the welding torch performing the weaving, In the welding speed calculation process, A welding amount and heat input calculation process, in which the relationship between the welding amount and heat input of the welding material is calculated using the following formulas (1) to (2), A remaining layer count calculation step in which the remaining number of layers for each of the aforementioned metal layers is calculated using the following formulas (3) to (6), The process for calculating the welding speed in the oblique direction is as follows: The welding speed in the oblique direction is calculated using the following formula (7), A welding method comprising a weaving speed calculation step of calculating the first welding speed of the welding torch in the first operation, the second welding speed of the welding torch in the second operation, the third welding speed of the welding torch in the third operation, and the fourth welding speed of the welding torch in the fourth operation using the following formulas (8) to (15). [Math 1] [Math 2] [Math 3] [Math 4] [Math 5] [Math 6] [Number 7]

2. A welding torch that melts the welding material, A means for moving the welding torch, A movement control unit that controls the aforementioned movement means, It includes a welding speed calculation unit that calculates the welding speed of the welding torch that is moved by the aforementioned moving means, The aforementioned movement control unit, A groove is formed between the end faces of a first member and a second member to be welded together, extending diagonally in a direction intersecting the horizontal plane and with a depth direction that is horizontal. The welding torch is weaved through this groove to form metal layers extending diagonally and vertically with the molten welding material, and the metal layers are controlled to be stacked in the depth direction. The weaving is performed for each of the metal layers, A first movement that proceeds in an upward direction along the end face of the first member, Following the first movement, a second movement is performed, which moves horizontally from the end face of the first member to the end face of the second member, Following the second operation, a third operation proceeds in an upward direction along the end face of the second member, Following the third operation, a fourth operation is performed, which involves gradually moving downward from the end face of the second member to the end face of the first member, and this sequence is repeated. The welding speed calculation unit is: A welding amount and heat input calculation unit calculates the relationship between the welding amount and heat input of the welding material using the following formulas (1) to (2), A remaining layer count calculation unit calculates the remaining number of layers for each of the aforementioned metal layers using the following formulas (3) to (6), The diagonal welding speed calculation unit calculates the diagonal welding speed using the following formula (7), A welding apparatus having a weaving speed calculation unit that calculates the first welding speed of the welding torch in the first operation, the second welding speed of the welding torch in the second operation, the third welding speed of the welding torch in the third operation, and the fourth welding speed of the welding torch in the fourth operation using the following formulas (8) to (15). [Number 8] [Number 9] [Number 10] [Math 11] [Math 12] [Number 13] [Number 14]

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