Friction stir welding method, friction stir welding device and friction stir welded material

Patent metadata

Field	Value
Publication number	US-9962787-B2
Application number	US-201314912680-A
Country	US
Kind code	B2
Filing date	Sep 11, 2013
Priority date	Sep 11, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A friction stir welding method for bonding a to-be bonded material, includes: a step of supplying nitrogen and introducing nitrogen into the to-be bonded material while melting the to-be bonded material; and a step of friction stir welding a portion of the non-bonded material in which the nitrogen is introduced. A friction stirring device for bonding a to-be bonded material, includes: a heating source for melting the to-be bonded material; a nitrogen supply source for supplying nitrogen to a melted portion of the to-be bonded material and introducing nitrogen into the to-be bonded material; and a friction stir tool for friction stir welding a portion of the non-bonded material in which the nitrogen is introduced.

First claim

The invention claimed is:

1. A friction stir welding method for bonding a to-be bonded material, comprising:
a step of supplying nitrogen and introducing the nitrogen into the to-be bonded material within a first shield wall, the first shield wall disposed over and around a portion of the to-be bonded material and around a friction stir tool, while melting the to-be bonded material;
a step of friction stir welding, by the friction stir tool, a portion of the to-be bonded material in which the nitrogen is introduced, the step of friction stir welding being performed continuously at the same time as the step of supplying and introducing the nitrogen; and
concurrently with the step of introducing nitrogen, a step of supplying and introducing argon into the to-be bonded material within a second shield wall partially disposed within the first shield wall.

2. The friction stir welding method according to claim 1 , wherein in the step of introducing the nitrogen and the step of friction stir welding being performed continuously at the same time, at least a portion of the to-be bonded material maintains an austenite phase.

3. The friction stir welding method according to claim 1 , wherein the to-be bonded material is melted by arc discharge or a carbon dioxide laser.

4. The friction stir welding method according to claim 1 , wherein the to-be bonded material is melted by arc discharge, and a heat input amount is 1 kJ/cm or more.

Assignees

• Hitachi Ltd

Inventors

• Sugimoto Itto
• Hirano Satoshi

Classifications

• H05B7/20

  Direct heating by arc discharge, i.e. where at least one end of the arc directly acts on the material to be heated, including additional resistance heating by arc current flowing through the material to be heated · CPC title

• B23K20/1245 Primary

  characterised by the apparatus · CPC title

• C23C26/00

  Coating not provided for in groups C23C2/00 - C23C24/00 · CPC title

• H05B7/185

  Heating gases for arc discharge (gas-filled discharge tubes H01J37/32) · CPC title

• B23K20/122

  using a non-consumable tool, e.g. friction stir welding · CPC title