Experiments on Gas-Metal-Arc Welding (MAG) with Combined Spin-Arc and Weaving Facilities, for Interdisciplinary Applications

Author:

Câmpurean Adrian M.1,Sîrbu Nicușor Alin2,Verbiţchi Victor2,Duma Iuliana2,Popescu Radu Nicolae2

Affiliation:

1. GeoEcoMar

2. ISIM Timisoara

Abstract

The article presents experiments for the development of the welding technology for plates of the steel S355JR, according to EN 10025-2:2004, for ship building and harbor structures.Marine steel plate grades for ship hull, according to ABS, American Bureau of Shipping, are presented, compared with the S355JR steel.For applications on board ships, the standard EN ISO 5778:1998 is also mentioned. It specifies the materials and quality levels for small weathertight steel hatches.The filler metal is the copper-coated, manganese-silicon-alloyed solid wire, type SG-3, according to EN ISO 14341:2020. The shielding gas is the gas mixture CORGON 18/82, according to EN ISO 14175:2008, type M21.As a welding travel unit, the modular drive system MDS-1, made by the company BUG-O Systems, of USA was used. It has the following main components: 1- rack-based track; 2- carriage; 3- master drive unit; 4- clutch; 5- weaver control module; 6- linear weaver unit; 7- linear weaver cross arm; 8- gun mounting group; 9- welding gun.The welding source is the Inverter MIG 300 A type, manufactured by Mahe GmbH, Germany.The sizes of the two plates for the welding test piece are: length 700 mm; width 200 mm; thickness 15 mm, I groove with 8 mm gap.The welding parameters used for all the layers (root, fill #1 - fill #4) are presented in a common table, for comparison.The parameter ranges are as follows: welding current 177-251 A; welding voltage 21.9-23.1 V; wire advance speed 6.5-7.2 m/min; shielding gas flow rate 20.8-21.8 liters/min; welding speed 20-45 cm/min. A special spin-arc welding method was applied on all weld layers. The execution of the welding test piece is described with specific details and photos.Upon visual inspection after the execution of each layer, the appearance is adequate. No defects or imperfections are observed.On ultrasonic examination, the results are adequate.Metallographic examination, tensile, bending and Charpy V impact tests are presented with appropriate results.The conclusions mention the adequate results obtained, regarding the ranges of the welding parameters and the use of the innovative spin-arc technology. Possible applications of the S355JR steel are recommended.The references present titles related to ship building steels, filler metal, shielding gas, welding equipment and some specific technologies.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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