Consumable electrode type gas shield arc welding method and arc welding portion
US10898967B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2017 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Oct 15, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/23
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention provides a consumable electrode type gas shield arc welding method for performing arc welding of two steel sheets using a welding torch having a consumable electrode. The consumable electrode type gas shield arc welding method includes performing arc welding while a shielding gas having an oxygen potential α which is indicated by the following Expression (1) and ranges from 1.5% to 5% is supplied from the welding torch toward the consumable electrode, and blowing an oxidation promotion gas having an oxygen potential β which is indicated by the following Expression (2) and ranges from 15% to 50% at a flow velocity ranging from 1 to 3 m/sec over a weld bead and a weld toe portion which are formed by arc welding and are in a state of 700° C. or higher, α=100×([V1(O2)]+[V1(CO2)]/5)/([V1(X)]+[V1(O2)]+[V1(CO2)]) Expression (1)β=100×[V2(O2)]/([V2(X)]+[V2(O2)]+[V2(CO2)]) Expression (2)here, [V1(X)] is a mixing ratio (volume %) of an inert gas included in the shielding gas, [V1(O2)] is a mixing ratio (volume %) of oxygen included in the shielding gas, [V1(CO2)] is a mixing ratio (volume %) of carbon dioxide included in the shielding gas, [V2(X)] is a mixing ratio (vo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.