JP2012020291A5

JP2012020291A5 -

Info

Publication number: JP2012020291A5
Application number: JP2010157933A
Authority: JP
Filing date: 2010-07-12
Publication date: 2012-03-15
Anticipated expiration: 2030-07-12

Description

請求項２記載の発明は、被溶接母材（３）の表面に対してレーザ光（１）の照射角度θ１が８０〜１００°で、溶接ワイヤ（２）の溶融池（５）への挿入角度θ２が９０〜１２０°であることを特徴とする請求項１記載の狭開先多層盛レーザ溶接方法である。 According to the second aspect of the present invention, the irradiation angle θ1 of the laser beam (1) is 80 to 100 ° with respect to the surface of the base material (3) to be welded, and the welding wire (2) is inserted into the molten pool (5). angle θ2 is narrow groove multi-pass laser welding method of claim 1, wherein 90 to 120 ° der Rukoto.

すなわち、請求項１記載の発明によれば、ホットワイヤ２はレーザ光１より溶接方向に対して後行させることで溶融池５の表面でのレーザ光１の反射の障害にならないようにし、さらに請求項２記載の発明によれば、ホットワイヤ２の溶融池５の表面に対する挿入角度θ２を母材３の表面に対して溶接進行方向の後方向側に９０度から１２０度の挿入角度θ２、望ましくは１００〜１１０度の挿入角度θ２で溶融池５の上方から挿入することで溶接ビード４が凹形状となり多層盛溶接に適した形状とすることができた。前記挿入角度θ２が９０度未満であるとレーザ光１とワイヤ２が干渉し、また前記挿入角度θ２が１２０度を超えるとワイヤ２が溶融池５後方に挿入されることになり溶接ビード４が凸形状になり次層溶接時に開先壁７の溶融が難しくなり融合不良発生の原因になる。 That is, according to the first aspect of the invention, e Ttowaiya 2 so as not to disorder the reflection of the laser beam 1 on the surface of the molten pool 5 by causing the rear row for welding direction from the laser beam 1, further According to the second aspect of the invention, the insertion angle θ2 of the hot wire 2 with respect to the surface of the molten pool 5 is set to an insertion angle θ2 of 90 to 120 degrees on the rear side in the welding progress direction with respect to the surface of the base material 3. Desirably, by inserting the weld bead 4 from above the molten pool 5 at an insertion angle θ2 of 100 to 110 degrees, the weld bead 4 has a concave shape and can be made into a shape suitable for multi-layer welding. When the insertion angle θ2 is less than 90 degrees, the laser beam 1 and the wire 2 interfere with each other, and when the insertion angle θ2 exceeds 120 degrees, the wire 2 is inserted behind the molten pool 5 and the weld bead 4 is formed. Due to the convex shape, it becomes difficult to melt the groove wall 7 at the time of the next layer welding, which causes a fusion failure.

また、図５に示すワイヤ２の溶融池５への挿入位置も重要なパラメータになり、ワイヤ
挿入位置とレーザ光１の中心軸の溶融池５への照射位置との間隔が大き過ぎると溶融池５の端にワイヤ２が挿入されることになり、ビード４の表面形状が凸形状になり次層溶接時に開先壁７の溶融が難しくなり融合不良発生の原因になる。逆にワイヤ２の溶融池５への挿入位置とレーザ光１の中心軸の溶融池５への照射位置との間隔が小さいとワイヤ２にレーザ光１が当たるようになり、ワイヤ２がレーザ光１により溶融され、溶断する現象が発生し、溶融池５の表面における波打ち溶接現象が乱れてビード４の形状に凹凸が発生する。 Further, the insertion position of the wire 2 in the molten pool 5 shown in FIG. 5 is also an important parameter, and if the distance between the wire insertion position and the irradiation position of the central axis of the laser beam 1 to the molten pool 5 is too large, the molten pool. Since the wire 2 is inserted into the end of the bead 5, the surface shape of the bead 4 becomes convex, and it becomes difficult to melt the groove wall 7 at the time of the next layer welding, which causes fusion failure. Conversely, if the distance between the insertion position of the wire 2 into the molten pool 5 and the irradiation position of the central axis of the laser beam 1 onto the molten pool 5 is small, the laser beam 1 will hit the wire 2 and the wire 2 will be irradiated with the laser beam. 1 melts and melts, and the wave welding phenomenon on the surface of the molten pool 5 is disturbed, resulting in irregularities in the shape of the beads 4 .

また、図５に示すように溶融池５の表面におけるワイヤ２の挿入位置も重要なパラメータになり、前記ワイヤ２の溶融池５の表面での挿入位置はレーザ光１の中心軸の溶融池５の表面より、例えば１〜３ｍｍだけ溶接進行方向の後側とする。ワイヤ２の溶融池５の表面での挿入位置をレーザ光１の中心軸の溶融池５の表面より、例えば３ｍｍより大き過ぎると溶融池５の端にワイヤ２が挿入されることになり、ビード形状が凸形状になって次層の溶接時に開先壁７の溶融が難しくなり、融合不良発生の原因になる。逆にワイヤ２の溶融池５の表面への前記挿入位置がレーザ光１の中心軸の溶融池５の表面より１ｍｍより小さいとワイヤ２にレーザ光１が当たるようになり、ワイヤ２がレーザ光１により溶融されて溶断する現象が発生し、溶融池５の表面が波打ち溶接現象により乱れてビード４の表面に凹凸が発生する。ワイヤ２の前記挿入位置はレーザ光１の中心軸の溶融池５の表面より、例えば２ｍｍ前後が最良であった。 As shown in FIG. 5, the insertion position of the wire 2 on the surface of the molten pool 5 is also an important parameter. The insertion position of the wire 2 on the surface of the molten pool 5 is the molten pool 5 on the central axis of the laser beam 1. From the surface , for example, 1 to 3 mm is set as the rear side in the welding progress direction. If the insertion position of the wire 2 on the surface of the molten pool 5 is too larger than, for example, 3 mm from the surface of the molten pool 5 at the central axis of the laser beam 1 , the wire 2 is inserted at the end of the molten pool 5, and the bead The shape becomes convex, and it becomes difficult to melt the groove wall 7 during the welding of the next layer, which causes poor fusion. Conversely, when the insertion position of the wire 2 on the surface of the molten pool 5 is smaller than 1 mm from the surface of the molten pool 5 at the central axis of the laser beam 1, the laser beam 1 hits the wire 2, and the wire 2 is irradiated with the laser beam. 1 melts and melts, and the surface of the molten pool 5 is disturbed by the wave welding phenomenon, and the surface of the bead 4 is uneven. The insertion position of the wire 2 was best , for example, about 2 mm from the surface of the molten pool 5 at the central axis of the laser beam 1 .

レーザ光１の中心軸の母材３の表面に対して溶接進行方向前側に傾斜させた傾斜角度θ１は８０度〜１１０度が最適で、溶融池５の前記傾斜角度α（パラメータは溶接速度、レーザパワー、ワイヤの送給量、ワイヤの挿入角度θ２）により変更する必要がある。
ステンレス鋼を用いた代表的溶接試験条件は、開先幅３ｍｍ、レーザパワー３ｋＷ、溶接速度０．５ｍ／ｍｉｎ、ワイヤ径１．２ｍｍ、ワイヤ送給速度６ｍ／ｍｉｎでビード高さ６ｍｍの溶接ビードを施工することができた。なお、上記ワイヤ径は１．２ｍｍに限定されるものではない。 The inclination angle θ1 inclined to the front side of the welding progress direction with respect to the surface of the base material 3 of the central axis of the laser beam 1 is optimally 80 degrees to 110 degrees, and the inclination angle α of the molten pool 5 (the parameter is the welding speed, The laser power, the wire feed amount, and the wire insertion angle θ2) need to be changed.
Typical welding test conditions using stainless steel are: a weld bead having a groove width of 3 mm, a laser power of 3 kW, a welding speed of 0.5 m / min, a wire diameter of 1.2 mm, a wire feed speed of 6 m / min and a bead height of 6 mm. Was able to be constructed. The wire diameter is not limited to 1.2 mm.

Claims

In a narrow groove multi-layer laser welding method in which a base material (3) to be welded that has been processed into a narrow groove using a welding wire (2) as a filler metal is welded with a multi-layer core,
A base material to be welded (laser beam (1)) that has been processed into the narrow groove by defocusing the laser beam (1).
3) is irradiated to melt the base metal (3) to be welded, and the welding wire (2) is energized between the welding wire (2) and the base metal (3) to be welded. ), A hot wire heated by resistance heat generation, and a molten pool (3) formed by melting the welded base material (3) at an angle approximate to the irradiation angle of the laser beam (1) behind the laser beam (1). 5)
The laser beam (1) is irradiated to the molten pool (5) formed by melting the base material (3) to be welded and inserting the welding wire (2) to the full groove width. Reflected light (1
′) Is irradiated from the narrow groove walls (7) ahead of the weld pool (5) in the welding direction to the groove bottom (8) or the already welded laminate (10 ′) from both side walls (7). And a molten pool (5) is continuously formed by melting and narrow gap multi-layer laser welding.

The irradiation angle θ1 of the laser beam (1) with respect to the surface of the base material (3) to be welded is 80 to 100 °,
Narrow Gap multi-pass laser welding method of claim 1, wherein the insertion angle θ2 of the molten pool of the welding wire (2) (5), characterized in 90 to 120 ° der Rukoto.