Tubular metal body, method of producing same, liner for pressure vessel and method of producing same
AssigneesShowa Denko K.K., Honda Motor Co., Ltd.
InventorYasuhiro Osame
Life of this patent
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Abstract
A tubular metal body 1 comprises a tube 2 extruded through a porthole die and composed of a plurality of components 2b joined to one another with a plurality of joint portions 2a extending over the entire length of the tube. The base material metal of the extruded tube 2 in each of the joint portions 2a is subjected to a modifying treatment to produce finely divided crystal grains. The modifying treatment for the extruded tube 2 is conducted preferably by frictionally agitating each joint portion using a probe 8 of a friction agitation joining tool 6. The tubular metal body 1 is available with an increased length in a larger size and has high pressure resistance.
Claims4
A method of producing a tubular metal body, comprising:
- preparing a tube extruded through a porthole die and comprising a plurality of components joined to one another with a plurality of joint portions extending over the entire length of the tube;
- placing a probe of a friction agitation joining tool from outside into each of the joint portions of the extruded tube so as to position the probe partly in the tube components on opposite sides of the joint portion;
- and
- moving the extruded tube and the probe relative to each other longitudinally of the tube to thereby frictionally agitate the base material metal of the extruded tube for a modifying treatment to produce finely divided crystal grains.
A method of producing a tubular metal body, comprising:
- preparing a tube extruded through a porthole die and comprising a plurality of components joined to one another with a plurality of joint portions extending over the entire length of the tube;
- placing a probe of a friction agitation joining tool from outside into each of the joint portions of the extruded tube immediately after extrusion so as to position the probe partly in the tube components on opposite sides of the joint portion;
- and
- moving the extruded tube and the probe relative to each other longitudinally of the tube to thereby frictionally agitate the base material metal of the extruded tube for a modifying treatment to produce finely divided crystal grains.
Dependencies are inferred from the claim text.