Abstract:
The present invention relates to a process for producing a branch (200) on a pre-insulated pipe (102,104), and to insulated branched medium conveying pipes obtainable by the process.
Abstract:
Provided is a process for producing a welded joint which includes a weld metal having high strength and high toughness, and containing fewer blowholes. The process for producing a welded joint according to the present embodiment includes the steps of: preparing a base material containing, by mass%, not less than 10.5% of Cr; and subjecting the base material to GMA welding using a shielding gas containing 1 to 2 volume% or 35 to 50 volume% of CO 2 gas, and the balance being inert gas, thereby forming a weld metal includes, by mass%, C: not more than 0.080%, Si: 0.20 to 1.00%, Mn: not more than 8.00%, P: not more than 0.040%, S: not more than 0.0100%, Cu: not more than 2.0%, Cr: 20.0 to 30.0%, Ni: 7.00 to 12.00%, N: 0.100 to 0.350%, O: 0.02 to 0.11%, sol. Al: not more than 0.040%, at least one of Mo: 1.00 to 4.00% and W: 1.00 to 4.00%, and the balance being Fe and impurities.
Abstract:
Tubulars are joined to each other without rotation of the tubulars. A coupling is placed between the aligned tubulars and is supported for rotation or oscillating about its longitudinal axis. The tubulars are clamped in a manner that allows a compressive force to be transmitted to the coupling as the coupling is rotated. An induction device can preheat each connection site before friction welding and/or provide heat as the connection is made and is allowed to cool down. The process can continuously create a string of casing or liner that can be run in or drilled into a wellbore.
Abstract:
The invention relates to a method for producing a cylinder tube (2), which is closed at the end so as to be fluid-tight, from a tubular blank (30). According to the invention the blank (30) is transformed into the cylinder tube (2) with the aid of a cold forming method in such a way that on an end region (6) of the cylinder tube (2) an opening (8) remains in the cylinder tube (30), a mounting region (12) is produced in the radially outer edge region (10) of the end region (6) and the cylinder tube (2) is closed by fluid-tight attachment on the mounting region (12) of an end piece (14) which closes the opening (8). A cylinder tube (2) comprises the cylinder tube (2) cold formed from the blank (30) having an opening (8) at the end, a mounting region (12) and an end piece (14) attached to the mounting region (12) so as to be fluid-tight. The method and the cylinder tube can be used for a shock absorber tube for a shock absorber of a motor vehicle.
Abstract:
A brazing composition contains 1 part by mass or more and 10 parts by mass or less of Zn powder, 1 part by mass or more and 5 parts by mass or less of Si powder, 3 parts by mass or more and 10 parts by mass or less of K-Al-F flux, 1 part by mass or more and 3 parts by mass or less of (meth)acrylic resin, wherein the mass ratio (Zn/Si) of Zn powder relative to Si powder is 1 or more and 5 or less.
Abstract:
The present invention provides a welding technology that allows stable welding even if a thin wire is used as a leading electrode in multiple-electrode submerged arc welding, particularly if welding is performed under welding conditions involving high wire feeding speed, or even if a flux-cored wire is used in which large winding remains after straightening. Provided are a welding torch, for use with a leading electrode in multiple-electrode submerged arc welding, that includes a contact tip, a connector for a power cable, a tube-shaped conductor disposed therebetween, and means for insulating the tube-shaped conductor from an electrode wire, and a multiple-electrode submerged arc welding method using such a welding torch.