A welding system configured to weld a first elongated element and a second elongated element together, and comprising: a first moving mechanism; a first fixture adapted to fix the first elongated element; a second moving mechanism; a second fixture adapted to fix the second elongated element; and a laser welding head adapted to emit a laser beam, wherein the first fixture is mounted on the first moving mechanism, and the first moving mechanism is configured to move the first fixture, so that in use, the first elongated element fixed on the first fixture is aligned with the second elongated element fixed on the second fixture, and wherein the first moving mechanism comprises a first moving platform adapted to move in the first direction, and a second moving platform mounted on the first moving platform and adapted to move in the second direction; wherein the first fixture is mounted on the second moving platform of the first moving mechanism; characterized in that the first moving mechanism and the second moving mechanism each is configured as a moving platform adapted to move in a first direction and a second direction perpendicular to the first direction in a horizontal plane; wherein the second moving mechanism comprises a first moving platform adapted to move in the first direction, and a second moving platform adapted to move in the second direction; wherein the second moving platform of the second moving mechanism is mounted on a base, and the first moving platform of the second moving mechanism is mounted on the second moving platform of the second moving mechanism; wherein the first moving mechanism and the second fixture are mounted on the first moving platform of the second moving mechanism; and wherein in use, the second moving mechanism is configured to move the first moving mechanism and the second fixture, so that an ideal welding center point (C') of the aligned first and second elongated elements (10, 20) is accurately located at a focal point of the laser beam from the laser welding head. a first moving mechanism; a first fixture adapted to fix the first elongated element; a second moving mechanism; a second fixture adapted to fix the second elongated element; and a laser welding head adapted to emit a laser beam, wherein the first fixture is mounted on the first moving mechanism, and the first moving mechanism is configured to move the first fixture, so that in use, the first elongated element fixed on the first fixture is aligned with the second elongated element fixed on the second fixture, and wherein the first moving mechanism comprises a first moving platform adapted to move in the first direction, and a second moving platform mounted on the first moving platform and adapted to move in the second direction; wherein the first fixture is mounted on the second moving platform of the first moving mechanism; characterized in that the first moving mechanism and the second moving mechanism each is configured as a moving platform adapted to move in a first direction and a second direction perpendicular to the first direction in a horizontal plane; wherein the second moving mechanism comprises a first moving platform adapted to move in the first direction, and a second moving platform adapted to move in the second direction; wherein the second moving platform of the second moving mechanism is mounted on a base, and the first moving platform of the second moving mechanism is mounted on the second moving platform of the second moving mechanism; wherein the first moving mechanism and the second fixture are mounted on the first moving platform of the second moving mechanism; and wherein in use, the second moving mechanism is configured to move the first moving mechanism and the second fixture, so that an ideal welding center point (C') of the aligned first and second elongated elements (10, 20) is accurately located at a focal point of the laser beam from the laser welding head.