Abstract:
Aims are to provide a tubular-body residual-stress improving apparatus and an adjustment method thereof capable of adjusting irradiation position with favorable reproducibility, even when an optical fiber is eccentric. In the tubular-body residual-stress improving apparatus, an optical control unit (5) includes a rotational hold mechanism (9) for holding an optical fiber (6) in a manner that the optical fiber (6) is rotatable in a circumferential direction of the optical fiber (6), and, if a position of an intensity peak of the laser beam from the optical fiber (6) in an axial direction of the tubular body (2) is offset from the center of an irradiation profile, a position at which the optical fiber (6) is held in the circumferential direction is adjusted by the rotational hold mechanism (9) so as to eliminate the offset or to minimize an influence of the offset.
Abstract:
PROBLEM TO BE SOLVED: To provide a welding method for an outer joint member, as well as an outer joint member, which is suitable for a long stem type constant velocity universal joint having a stable quality based on sure inspection of a welding part, with improved quality in the welding part and reduction in manufacturing cost due to skipping or reduction in additional step or post-step.SOLUTION: In an outer joint member 11 of a constant velocity universal joint 10, a cup part 12 where a track groove 30 engaged with a torque transmission element 19 is formed on an inner periphery thereof, a shaft part 13 formed at a bottom part of the cup part 12, is configured with at least two separate members, and a cup member 12a forming the cup part 12 and a shaft member 13b forming the shaft part 13 are joined together. In a welding method therefor, the cup member 12a and the shaft member 13b have a shape which forms a closed hollow void part 47 when end parts 72, 73, 74, and 75 thereof are abutted with each other. Under a condition in which the hollow void part 47 is under an atmospheric pressure or less, the end parts 72, 73, 74 and 75 formed when the cup member 12a and the shaft member 13b are abutted with each other are melted and weld.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a weld steel pipe having excellent buckling resistance.SOLUTION: The method for production of the weld steel pipe includes a step of preparing an original pipe to be welded, and a step of expanding the whole length of the original pipe using a pipe-expanding head so that the undulation wavelength ratio D defined by formula (1): D=p/λ becomes 0.8 or less or 1.8 or more to obtain the weld steel pipe. In the formula (1), p is an undulation wavelength of the weld steel pipe in an axial direction, and λ is the buckling wavelength of Timoschenko defined by formula (2): λ=3.44×(r×t)(wherein r and t are respectively the inner diameter and thickness of the weld steel pipe).
Abstract:
PROBLEM TO BE SOLVED: To provide a joint structure for metallic pipes, configured in such a manner that the metallic pipes are joined together without a degradation in the reliability of the joint between the metallic pipes and with a minimum increase in cost.SOLUTION: The joint structure for metallic pipes is configured in such a manner that either a first metallic pipe 11 which contains first metal M1 as the main component or a second metallic pipe 12 which contains second metal M2 as the main component has an end section which is an expanded-diameter section 13 for connection, the expanded-diameter section 13 having an inner diameter greater than the inner diameter of an adjacent section 16 adjacent to the end section. An inter-metal chemical compound layer 15 formed by the first metal M1 and the second metal M2 is present at the interface between the first metal M1 and the second metal M2 at a position between a brazing material 14 and the one or the other metallic pipe, and the thickness of the inter-metal chemical compound layer 15 is smaller at the base end 13b-side end section 15b of the inter-metal chemical compound layer 15 than at the opening end 13a-side end section 15a thereof.