Effect of Ni content on the microstructure and mechanical properties of weld metal with both-side submerged arc welding technique

To research effect of welding thermal cycle on the microstructure and mechanical properties of welded joint, two pieces of 60mm thick plates were welded together using automatic submerged-arc welding (SAW) method with suitable welding parameters. After 17 passes welding, the microstructures and phases of the welded joint was carefully observed and analyzed by using a Carl Zeiss optical microscope in different zones of welded joint, and the surface micro-hardness of the welded joint was measured systematically by using microscopic-hardness tester Lycra. Afterwards, the mechanical properties of the weld metals were measured through stretching. Through a series of measurements and observations, the welding experiment results indicate that effect of welding thermal cycle on the microstructure and mechanical properties of welding joint is great, the grains of the bottom of the weld metal are certainty smaller and more uniform, and the bottom of the weld metal have more excellent mechanical properties.

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Investigation on Deposited Metal Properties of Homemade Nickel and Nickel-Free Electrodes and Fluxes for Submerged Arc Welding of SA-508 Gr.3 Cl.1

Volume 2: Plant Systems, Structures, Components and Materials ◽

10.1115/icone25-66331 ◽

2017 ◽

Author(s):

Le Mei ◽

Junbao Zhang ◽

Yifeng Huang ◽

Yan Yu ◽

Yong Jiang ◽

...

Keyword(s):

Mechanical Properties ◽

Weld Metal ◽

Arc Welding ◽

Proton Irradiation ◽

Submerged Arc Welding ◽

Impact Property ◽

Welding Material ◽

Weld Metals ◽

Metal Properties ◽

Submerged Arc

Up to now, two kinds of filler metal with or without nickel element for submerged arc welding have been largely used in the reactor pressure vessel (RPV) manufacturing. In order to study the effect of nickel element on weld metal properties of SA-508 Gr.3 Cl.1, submerged arc welding material with nickel (AWS classification F8P4-EGN-F2N, F2 for short) and welding material without nickel (F8P4-EA3N-A3N, A3 for short) were used; and conventional mechanical properties, low-cycle fatigue test, and proton irradiation analysis of the two weld metals were studied. Results show that the mechanical properties of the two different weld metals are similar, except that the Charpy V-notch impact property of the weld metal with nickel is better than that without nickel; the micro-structures of F2 and A3 weld metals are both composed of ferrite base and granular bainite, but the columnar grain size of F2 weld metal is smaller relatively, which results in better impact property. In addition, the irradiated A3 weld metal has fewer dislocation loops than the irradiated F2 weld metal after the same proton irradiation dose; the irradiated weld metals both have higher micro-Vickers hardness than before.

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Investigation of microstructure and mechanical properties of AISI2205/DIN-P355GH steel joint by submerged arc welding

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2020.10.023 ◽

2020 ◽

Vol 59 ◽

pp. 566-586

Author(s):

Hüseyin Küçüköner ◽

Halil Karakoç ◽

Nizamettin Kahraman

Keyword(s):

Mechanical Properties ◽

Arc Welding ◽

Submerged Arc Welding ◽

Steel Joint ◽

Microstructure And Mechanical Properties ◽

Submerged Arc

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Microstructure and Mechanical Properties of Submerged Arc Welding Filled with Ni Wire Dissimilar Joints Comprising SUS304 and Q245R

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.936.1780 ◽

2014 ◽

Vol 936 ◽

pp. 1780-1785

Author(s):

Peng Xian Zhang ◽

Peng Zhao ◽

Yan Quan Cui

Keyword(s):

Mechanical Properties ◽

Weld Metal ◽

Alloy Steel ◽

Arc Welding ◽

Molten Pool ◽

Welded Joint ◽

Submerged Arc Welding ◽

Low Alloy Steel ◽

Allocation Process ◽

Submerged Arc

Aim at the issue that the bending crack is easy to generate inside dissimilar welded joint of low alloy steel and stainless steel, a new process of submerged arc welding filled with Ni wire is put forward. The influence mechanism of filling quantity of Ni wire to the joint of microstructure evolutions and mechanical properties is mainly explored based on the contrast test of non-filling Ni wire and three different filling speeds of Ni wire. The experiment results indicate that, the filling process of Ni wire supplies austenite forming element, and alters heat allocation process of molten pool. The filling quantity of Ni wire is the quantitative parameter, it is used to control the transition width between low alloy steel and weld metal, also to adjust the peak temperature and holding time at elevated temperature of molten pool. When the value of the filling quantity of Ni wire is determined, the problem of bending crack in the fusion zone of low alloy steel can be solved, and also the overheat damage can be eliminated. At the same time, the grains of weld metal and heat affected zone are refined. And on this basis the plasticity, toughness and microhardness of welded joint can be guaranteed.

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Establishment of Cold Wire Addition Technology® in Multiwire Submerged Arc Welding for Line Pipe Manufacturing to Improve the Weldment Quality

ASME 2015 India International Oil and Gas Pipeline Conference ◽

10.1115/iogpc2015-7957 ◽

2015 ◽

Cited By ~ 1

Author(s):

Ramakrishnan Mannarsamy ◽

S. K. Shrivastava ◽

Piyush Thakor ◽

Gautam Chauhan ◽

S. K. Joshi ◽

...

Keyword(s):

Mechanical Properties ◽

Weld Metal ◽

Arc Welding ◽

Welding Process ◽

High Strength ◽

Submerged Arc Welding ◽

Line Pipe ◽

Cold Wire ◽

Welding Procedure ◽

Submerged Arc

For achieving high productivity multiple wire submerged arc welding such as tandem wire, three wires and five wires submerged arc welding was introduced in recent past years. Due to adding of additional wires in a pipe mill faced process difficulties such as controlling the current supply to each wire and further challenges for consumable design in order to give effective slag characteristics and bead shape control at these higher welding speeds and heat inputs. To gain maximum productivity, welding speed must be as fast as possible (in excess of 2 m/min) consistent with reliable high speed wire feeding and the characteristics of the SAW flux considering these factors in determining the balance of heat input, penetration, bead shape, dilution, weld metal chemistry and mechanical properties such as toughness. Steels containing high strength low alloying elements like Manganese, Molybdenum, Titanium and boron have favorable physical properties such as higher subzero toughness, resistance to improve the mechanical properties because of which there is substantial saving in the material. High strength low alloy steels materials are utilized in offshore and onshore at critical services. However, such benefits can be exploited provided these steels can be welded with appropriate development of welding process such as cold wire addition® in multi wires with process controller using WINCC programmer, Z5 version to give better weldments, which will not compromise the integrity, and operating condition. To obtain higher productivity and quality, it is necessary to develop a welding procedure for butt joint of line pipe steels. This paper describes the recent work carried out by Welspun, in this regard to establish the welding procedure using GMAW and submerged arc welding process and evaluation of mechanical properties. Macro and micro structural analysis were also made to characterize the weld metal properties.

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