Electrogas arc welding (EGW) is used for vertical position welding of sheer strakes and hatch side coamings of container ships because of its higher welding efficiency. However, in ordinary welding processes for ultra-thick steel plates, defects such as the lack of fusion are likely to occur. In order to solve this problem and others, a two-electrode VEGA (Vibratory Electrogas Arc Welding) process was developed. This paper provides an outline thereto and describes the essential characteristics of this newly developed process for vertical position welding on extra heavy-sectioned steel plates having thicknesses of 50 mm to 70 mm. It was demonstrated that the VEGA process achieves a stabilized fusion-line profile for ultra-thick steel plates with higher welding efficiency. The VEGA welding process realizes stable weld metal penetration and high efficiency in single-pass, vertical position welding of steel plates, and has obtained valuable tried and tested data through its applications in actual container ship building. It was then confirmed that joint performance in this study satisfies regulations such as class NK KEW53 and KEW53Y40. The scope of application to steel plate thicknesses will expand in the future and can be expected to become more widely applied because of its superior applicability as a welding method.
Development of two-electrode electrogas arc welding process
Entwicklung eines Elektrogaslichtbogenschweißverfahrens mit zwei Elektroden
Nippon Steel Technical Report ; 90 ; 67-74
2004
8 Seiten, 16 Bilder, 5 Tabellen, 7 Quellen
Aufsatz (Zeitschrift)
Englisch
Application of electroslag- and electrogas welding in shipbuilding
Tema Archiv | 1981
Electrogas welding of advanced double-hull subassemblies
Tema Archiv | 1996
|Shipyard welding - toughness evaluation of electrogas and electroslag weldments
Tema Archiv | 1974
|A study of electrogas welding process for verticalwelding joint in the shipbuilding
Tema Archiv | 2007
|Automatic ElectroGas Welding Device with Vertically going or Horizontally going type
Europäisches Patentamt | 2018
|