Gas-shielded arc welding method

Patent metadata

Field	Value
Publication number	US-10864594-B2
Application number	US-201615748868-A
Country	US
Kind code	B2
Filing date	Jul 27, 2016
Priority date	Jul 31, 2015
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A gas-shielded arc welding method includes feeding a consumable electrode via a welding torch and performing welding while flowing a shielding gas. The welding torch includes a nozzle. An inner diameter of the nozzle is 15 mm or more. A nozzle-base material distance between a tip of the nozzle and a material to be welded is 22 mm or less. A ratio expressed by (the inner diameter of the nozzle/the nozzle-base material distance) is 0.7 or more and 1.9 or less.

First claim

The invention claimed is:

1. A gas-shielded arc welding method, comprising:
feeding a consumable electrode via a welding torch having a nozzle including an orifice; and
welding a welding part of a material to be welded while flowing a shielding gas such that the nozzle shields the welding part from atmospheric air by using the shielding gas rectified by the orifice of the nozzle,
wherein
the consumable electrode contains S in an amount of 0.015 mass % or more based on an entire mass of the consumable electrode,
the shielding gas is a mixed gas comprising 92% or more of Ar, the balance being at least one of carbon dioxide and oxygen, and inevitable impurities,
an inner diameter of the nozzle is 15 mm or more,
a nozzle-base material distance between a tip of the nozzle and the material to be welded is 22 mm or less, and
a ratio of the inner diameter of the nozzle to the nozzle-base material distance is 0.7 or more and 1.9 or less.

2. The gas-shielded arc welding method according to claim 1 , wherein a flow rate of the shielding gas is 18 L/min or less.

3. The gas-shielded arc welding method according to claim 1 , wherein a ratio of flow rate of the shielding gas to the inner diameter of the nozzle is 0.65 L/min·mm or more and 1.10 L/min·mm or less.

4. The gas-shielded arc welding method according to claim 1 , wherein the shielding gas comprises 95% or more of Ar.

5. The gas-shielded arc welding method according to claim 1 , wherein the consumable electrode contains S in an amount of 0.020 mass % or more based on the entire mass of the consumable electrode.

6. The gas-shielded arc welding method according to claim 1 , wherein an average welding current is 250 A or less.

7. The gas-shielded arc welding method according to claim 1 , wherein pulse current control in which a peak current is 380 A or more and 530 A or less and a peak width is 0.5 to 2.0 milliseconds is performed.

8. The gas-shielded arc welding method according to claim 1 , wherein the material to be welded is a zinc-plated steel sheet having a basis weight of zinc plated of 20 to 100 g/m 2 or more.

9. A method for producing a weldment, the method comprising
welding by the gas-shielded arc welding method according to claim 1 .

10. A weldment, welded by the gas-shielded arc welding method according to claim 1 .

11. The gas-shielded arc welding method according to claim 1 , wherein the nozzle includes a straight portion having an inner diameter same as the inner diameter of the nozzle.

12. The gas-shielded arc welding method according to claim 1 , wherein the consumable electrode contains Si in an amount of 0.20 to 2.50 mass % and Mn in an amount of 0.50 to 3.50 mass %.

13. The gas-shielded arc welding method according to claim 1 , consisting of the feeding of the consumable electrode and the welding of the welding part.

Assignees

• Kobe Steel Ltd
• Mazda Motor

Inventors

• Miyata Minoru
• Suzuki Reiichi
• Tanaka Masaaki
• Fukahori Mitsugi
• Ogawa Takashi

Classifications

• B23K35/302

  Cu as the principal constituent · CPC title

• B23K35/0261

  Rods, electrodes or wires · CPC title

• B23K35/30

  with the principal constituent melting at less than 1550°C · CPC title

• B23K9/295

  using consumable wire electrodes · CPC title

• B23K35/0266

  flux-cored · CPC title