WO1999059767A1 - Method and arrangement for improving quality in fusion welding operations - Google Patents
Method and arrangement for improving quality in fusion welding operations Download PDFInfo
- Publication number
- WO1999059767A1 WO1999059767A1 PCT/SE1999/000793 SE9900793W WO9959767A1 WO 1999059767 A1 WO1999059767 A1 WO 1999059767A1 SE 9900793 W SE9900793 W SE 9900793W WO 9959767 A1 WO9959767 A1 WO 9959767A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- protective
- gas flow
- hose
- flush
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
- B23K26/1462—Nozzles; Features related to nozzles
- B23K26/1494—Maintenance of nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
Definitions
- the present invention relates to a method for improving quality in fusion welding operations where protective gas is supplied to the welding point via a hose line.
- the invention also relates to an arrangement for use in implementing the method.
- the present invention is based on the knowledge that a contributory cause of such porosity resulting from moisture may be condensate which for various reasons is formed on the inside of protective-gas hoses and welding guns. This moisture is then conveyed forward by the protective gas to the pool at the welding point. Tests performed have also confirmed that this is the case. In other welding operations, such as welding stainless steel, titanium, high-alloy stainless steel, nickel-based steel and magnesium, problems associated with inter alia oxidation which is difficult to explain arise. With the knowledge that has been gained in the development of the present invention, it has emerged that these problems also may be due to impurities which originate from the inside of the protective-gas hose and are supplied to the pool by the gas flow. Such impurities may consist of oxygen and also moisture which diffuse in through the walls of the hoses used for the protective-gas flow. Other impurities present in the hoses can also influence the weld quality.
- the main object of the present invention is to produce a technique which considerably reduces the quality impairments which occur in fusion welding using protective gas as a consequence of impurities brought along by the protective gas from the inside of the protective-gas hoses.
- this is achieved by virtue of the fact that a small flush-gas flow is made to flow through the protective-gas hoses even when the normal protective-gas flow is shut off. In this way, moisture is prevented from condensing on the inside of the hose, and other impurities are prevented from accumulating there when the protective-gas flow is shut off.
- Fig. 1, 1 designates a gas bottle containing a gas or gas mixture which is to be used as a protective gas in a welding operation.
- the gas may be, for example, an inert gas or gas mixture or comprise nitrogen.
- it is important that the gas or gas mixture has a low moisture content.
- Reference number 2 designates a pressure-reducing valve which is connected via a protective-gas hose 3 to a solenoid valve 4 which is usually controlled by a welding gun connected to the valve.
- the solenoid valve is usually combined with a wire-feeding unit.
- the welding gun is actuated, the solenoid valve 4 then being opened so that protective gas can flow forward to the pool.
- the protective-gas flow is therefore shut off.
- Moisture and gases, such as oxygen may also diffuse in through the hose wall and accumulate on its inside.
- moisture and other impurities on the inside of the protective-gas hose will then be conveyed to the pool by the protective-gas flow.
- moisture constitutes a source of porosity in the weld joint, in particular in the case of aluminium welding, and oxygen gives rise to undesirable oxidation of the weld metal.
- a bypass line 5 with a valve arrangement 6 has been connected in so as to be parallel to the solenoid valve 4.
- the valve 6 can be adjusted so that a small flow of protective gas always passes through the bypass line 5, which means that a continuous flow through the protective-gas hose 3 and the welding gun is obtained, even when protective gas is not flowing through the solenoid valve 4.
- This flush-gas flow prevents moisture or other impurities accumulating on the inner surface of the protective-gas hose 3 during the time when the equipment is inactive. Such impurities would otherwise be supplied to the pool in the next welding operation.
- the valve arrangement 6 may consist of a fixed throttle or a regulating valve which, if so desired, can be controlled depending on the opening and closing of the solenoid valve 4.
- the flush-gas flow may be of the order of, for example, 1 1/min and flow through both the protective-gas hose and the welding gun. When what is known as root protection is used for the weld, a flush- gas flow can also flow through the associated hose line.
- the solenoid valve 4 can itself be made with a passage for a flush-gas flow which flows even when the main passage of the solenoid valve is shut.
- the principle according to the invention can be used in all types of fusion welding operations irrespective of the material combinations to be welded.
- the flush-gas flow suitably consists of the same gas or gas mixture as the protective-gas flow. However, it is of course possible to use a separate source of flush gas, if desired.
- the flush gas should preferably be of the inert type but may also consist of nitrogen for certain applications. In the case of aluminium welding in particular, it is important that the gas or gas mixture has a low moisture content. In other applications, such as, for example, welding stainless steel and the like, it may be a requirement for the flush gas to have a low oxygen content.
- the gas may be ready-mixed or be mixed by means of a mixer. It can be kept in a pressure container, such as a gas bottle, or in liquid form in a pressure tank.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU46606/99A AU4660699A (en) | 1998-05-15 | 1999-05-11 | Method and arrangement for improving quality in fusion welding operations |
US09/700,152 US6634544B1 (en) | 1998-05-15 | 1999-05-11 | Method and arrangement for improving quality in fusion welding operations |
AT99929980T ATE254979T1 (en) | 1998-05-15 | 1999-05-11 | METHOD AND DEVICE FOR IMPROVING QUALITY IN FUSION WELDING OPERATIONS |
HU0102069A HUP0102069A3 (en) | 1998-05-15 | 1999-05-11 | Method and arrangement for improving quality in fusion welding operations |
DE69913141T DE69913141T2 (en) | 1998-05-15 | 1999-05-11 | METHOD AND DEVICE FOR IMPROVING THE QUALITY IN FUSION WELDING PROCESSES |
EP99929980A EP1089847B1 (en) | 1998-05-15 | 1999-05-11 | Method and arrangement for improving quality in fusion welding operations |
BR9910487-3A BR9910487A (en) | 1998-05-15 | 1999-05-11 | Method and disposition for improving quality in fusion welding operations |
NO20005674A NO318082B1 (en) | 1998-05-15 | 2000-11-10 | Method and arrangement for quality improvement in melt welding operations |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9801730-4 | 1998-05-15 | ||
SE9801730A SE9801730L (en) | 1998-05-15 | 1998-05-15 | Methods and apparatus for improving the quality of melt welding operations |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999059767A1 true WO1999059767A1 (en) | 1999-11-25 |
Family
ID=20411344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1999/000793 WO1999059767A1 (en) | 1998-05-15 | 1999-05-11 | Method and arrangement for improving quality in fusion welding operations |
Country Status (11)
Country | Link |
---|---|
US (1) | US6634544B1 (en) |
EP (1) | EP1089847B1 (en) |
AT (1) | ATE254979T1 (en) |
AU (1) | AU4660699A (en) |
BR (1) | BR9910487A (en) |
CZ (1) | CZ296354B6 (en) |
DE (1) | DE69913141T2 (en) |
HU (1) | HUP0102069A3 (en) |
NO (1) | NO318082B1 (en) |
SE (1) | SE9801730L (en) |
WO (1) | WO1999059767A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10124227C5 (en) * | 2001-05-18 | 2007-08-30 | Air Liquide Deutschland Gmbh | Apparatus for cooling by means of adiabatic expansion of a gas or gas mixture |
TWI511829B (en) * | 2010-03-15 | 2015-12-11 | Daihen Corp | Arc welding apparatus |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7170032B2 (en) | 2003-11-20 | 2007-01-30 | Tri Tool Inc. | Process for welding |
EP4052833A1 (en) * | 2021-03-03 | 2022-09-07 | FRONIUS INTERNATIONAL GmbH | Inert gas hose for guiding an inert gas for a welding process and method for flushing such an inert gas hose |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2135545A1 (en) * | 1971-07-16 | 1973-01-25 | Claus Dammers | Cleaning welding burners - using blasts of air and parting agent-air mixt |
EP0074106A1 (en) * | 1981-09-09 | 1983-03-16 | Alexander Binzel GmbH & Co. KG | Water-cooled protective gas welding torch for automatic welding appliances with a gas nozzle with internal blow-out facilities |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1325116A (en) * | 1919-12-16 | Island | ||
US2504867A (en) * | 1948-06-22 | 1950-04-18 | Air Reduction | Method of arc welding |
US2788429A (en) * | 1954-03-22 | 1957-04-09 | Gen Motors Corp | Process and gas for inert gas shielded arc welding |
US3089944A (en) * | 1962-01-19 | 1963-05-14 | Air Reduction | Arc welding |
DK149741C (en) * | 1983-02-16 | 1987-12-28 | Christian Chemnitz | ELECTRIC WELDING APPLIANCE |
-
1998
- 1998-05-15 SE SE9801730A patent/SE9801730L/en not_active Application Discontinuation
-
1999
- 1999-05-11 HU HU0102069A patent/HUP0102069A3/en unknown
- 1999-05-11 AU AU46606/99A patent/AU4660699A/en not_active Abandoned
- 1999-05-11 AT AT99929980T patent/ATE254979T1/en not_active IP Right Cessation
- 1999-05-11 US US09/700,152 patent/US6634544B1/en not_active Expired - Fee Related
- 1999-05-11 DE DE69913141T patent/DE69913141T2/en not_active Expired - Fee Related
- 1999-05-11 WO PCT/SE1999/000793 patent/WO1999059767A1/en active IP Right Grant
- 1999-05-11 CZ CZ20004253A patent/CZ296354B6/en not_active IP Right Cessation
- 1999-05-11 EP EP99929980A patent/EP1089847B1/en not_active Expired - Lifetime
- 1999-05-11 BR BR9910487-3A patent/BR9910487A/en not_active IP Right Cessation
-
2000
- 2000-11-10 NO NO20005674A patent/NO318082B1/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2135545A1 (en) * | 1971-07-16 | 1973-01-25 | Claus Dammers | Cleaning welding burners - using blasts of air and parting agent-air mixt |
EP0074106A1 (en) * | 1981-09-09 | 1983-03-16 | Alexander Binzel GmbH & Co. KG | Water-cooled protective gas welding torch for automatic welding appliances with a gas nozzle with internal blow-out facilities |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10124227C5 (en) * | 2001-05-18 | 2007-08-30 | Air Liquide Deutschland Gmbh | Apparatus for cooling by means of adiabatic expansion of a gas or gas mixture |
TWI511829B (en) * | 2010-03-15 | 2015-12-11 | Daihen Corp | Arc welding apparatus |
Also Published As
Publication number | Publication date |
---|---|
AU4660699A (en) | 1999-12-06 |
US6634544B1 (en) | 2003-10-21 |
SE9801730D0 (en) | 1998-05-15 |
DE69913141T2 (en) | 2004-09-16 |
SE9801730L (en) | 1999-11-16 |
ATE254979T1 (en) | 2003-12-15 |
NO318082B1 (en) | 2005-01-31 |
NO20005674L (en) | 2000-11-10 |
EP1089847B1 (en) | 2003-11-26 |
HUP0102069A3 (en) | 2001-11-28 |
CZ20004253A3 (en) | 2001-07-11 |
BR9910487A (en) | 2001-01-09 |
NO20005674D0 (en) | 2000-11-10 |
DE69913141D1 (en) | 2004-01-08 |
EP1089847A1 (en) | 2001-04-11 |
HUP0102069A2 (en) | 2001-10-28 |
CZ296354B6 (en) | 2006-02-15 |
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