ANALISIS SAMBUNGAN LAS GTAW COPPER-NICKEL (CuNi) TERHADAP NICKEL-CHROMIUM IRON STEEL (FeCrNi) ALLOYS

2014 ◽  
Vol 4 (2) ◽  
pp. 71
Author(s):  
A Yudia Bakti ◽  
Surasno Surasno
Keyword(s):  
Weld Metal ◽  
Heat Input ◽  
Fusion Line ◽  
Dissimilar Metal ◽  
Copper Nickel ◽  
Nickel Chromium

Sambungan las dissimilar metal CuNi-FeCrNi Alloys mempunyai permasalahan pada penetrasi dan sifat mekanis. Telah dilakukan rancangan pengelasan logam paduan CuNi-FeCrNi dengan parameter Heat input (2145 s.d 4680) J/cm untuk menghasilkan sambungan las yang baik tanpa cacat-cacat las. Hasil pengelasan menunjukkan penetrasi logam las yang baik pada sisi bevel dan arah vertikal, struktur makroskopis penampang sambungan las tidak terdapat cacat-cacat las, sifat-sifat mekanis: kekuatan tarik 46,56 kg/mm2, keuletan 31,25%, reduksi penampang 33,10%, dan lokasi patah di fusionline las CuNi tidak terdapat cacat las. Dari hasil uji bending tidak ditemukan retak. Nilai kekerasan di HAZ CuNi berkisar antara 128,3-137,9 VHN, di logam las (Weld Metal) antara 177-195 VHN, dan di HAZ FeCrNi berkisar antara 195-210 VHN. Hasil sambungan las berupa struktur dendritic dengan bentuk butir epitaxial di sekitar fusion line. Sambungan las CuNi-FeCrNi telah menunjukkan hasil pengelasan GTAW yang baik dan dapat digunakan pada pemakaian sambungan las peralatan penukar panas di industri.Kata kunci: copper nickel, nickel-chromium iron steel, dissimilar metal, heat input

Study the Effect of Welding Position and Plate Thickness to the Mechanical and Microstructural Properties of the TIG Dissimilar Metal Welded between Carbon Steel ASTM A36 and Stainless Steel 304 Plates

2020 ◽  
Vol 1000 ◽  
pp. 364-372
Author(s):  
Winarto Winarto ◽  
Muhammad Anis ◽  
Rini Riastuti ◽  
I.N. Suarjana
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Carbon Steel ◽  
Weld Metal ◽  
Fusion Line ◽  
Bending Test ◽  
Test Results ◽  
Dissimilar Metal ◽  
Stainless Steel 304 ◽  
Welding Position

Dissimilar metal welding was mostly done to optimize the application and engineering requirements with economic considerations. Weld microstructures greatly influenced the mechanical properties of welded joints. The investigations were carried out to evaluate the microstructural and mechanical properties of dissimilar weldment between carbon steel ASTM A36 and austenitic stainless steel 304 with a variation of welding position (1G, 2G, 3G) and weld thickness (6 mm to 12 mm) joints by TIG welding. A detailed analysis was conducted on the weld zone composition, the microstructural, and mechanical properties. The results show that the welding position and thickness of the weld joints influenced the microstructure both in HAZ and weld metal. Size, distribution, and orientation of microstructure were improved and more uniform with increasing of welded joint thickness. In HAZ carbon steel, GB ferrite was dominant, especially for the flat welding position (1G), while for the horizontal position (2G) and the vertical welding position (3G) showed other structures such as Widmanstaten ferrite, hard-structures like martensite and bainite. In the region near the fusion line and the weld metal, the chemical composition changed due to thermal convection, diffusion, and macro-segregation caused by penetration of liquid metal carbon steel into the weld pool. SEM/EDS results indicated diffusion of carbon from carbon steel A36 to stainless steel 304 and formed the hard-structure along the fusion line. The mechanical test results showed that the tensile test breaking point occurred in the parent metal of carbon steel A36. The bending test results showed very high stress on the face side of the welding joint, and there are no cracks from the bending test result. Vickers hardness testing showed that the hardness distribution increased from the carbon steel HAZ to the stainless steel HAZ, and the maximum hardness has achieved the value of 297 Hv at the fusion line of stainless steel 304.

scholarly journals Influence of the Heat Input on the Dendritic Solidification Structure and the Mechanical Properties of 2.25Cr-1Mo-0.25V Submerged-Arc Weld Metal

2021 ◽  
Author(s):  
Hannah Schönmaier ◽  
Ronny Krein ◽  
Martin Schmitz-Niederau ◽  
Ronald Schnitzer
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Heat Input ◽  
Stress Rupture ◽  
Pressure Vessels ◽  
Rupture Time ◽  
Solidification Structure ◽  
Welding Parameters ◽  
Austenite Grain Size ◽  
Submerged Arc

AbstractThe alloy 2.25Cr-1Mo-0.25V is commonly used for heavy wall pressure vessels in the petrochemical industry, such as hydrogen reactors. As these reactors are operated at elevated temperatures and high pressures, the 2.25Cr-1Mo-0.25V welding consumables require a beneficial combination of strength and toughness as well as enhanced creep properties. The mechanical properties are known to be influenced by several welding parameters. This study deals with the influence of the heat input during submerged-arc welding (SAW) on the solidification structure and mechanical properties of 2.25Cr-1Mo-0.25V multilayer metal. The heat input was found to increase the primary and secondary dendrite spacing as well as the bainitic and prior austenite grain size of the weld metal. Furthermore, it was determined that a higher heat input during SAW causes an increase in the stress rupture time and a decrease in Charpy impact energy. This is assumed to be linked to a lower number of weld layers, and therefore, a decreased amount of fine grained reheated zone if the multilayer weld metal is fabricated with higher heat input. In contrast to the stress rupture time and the toughness, the weld metal’s strength, ductility and macro-hardness remain nearly unaffected by changes of the heat input.

Effects of oxygen content on microstructure and impact toughness of high heat input flux-cored wire weld metals

2018 ◽  
Vol 115 (4) ◽  
pp. 410
Author(s):  
Fengyu Song ◽  
Yanmei Li ◽  
Ping Wang ◽  
Fuxian Zhu
Keyword(s):  
Grain Size ◽  
Impact Toughness ◽  
Weld Metal ◽  
Oxygen Content ◽  
Heat Input ◽  
High Heat ◽  
Cored Wire ◽  
Weld Metals ◽  
High Heat Input ◽  
The Impact

Three weld metals with different oxygen contents were developed. The influence of oxygen contents on the microstructure and impact toughness of weld metal was investigated through high heat input welding tests. The results showed that a large number of fine inclusions were formed and distributed randomly in the weld metal with oxygen content of 500 ppm under the heat input condition of 341 kJ/cm. Substantial cross interlocked acicular ferritic grains were induced to generate in the vicinity of the inclusions, primarily leading to the high impact toughness at low temperature for the weld metal. With the increase of oxygen content, the number of fine inclusions distributed in the weld metal increased and the grain size of intragranular acicular ferrites decreased, which enhanced the impact toughness of the weld metal. Nevertheless, a further increase of oxygen content would contribute to a great diminution of the austenitic grain size. Following that the fraction of grain boundary and the start temperature of transformation increased, which facilitated the abundant formation of pro-eutectoid ferrites and resulted in a deteriorative impact toughness of the weld metal.

Influence of Nitrogen and Heat Input on Weld Metal of Gas Tungsten Arc Welded High Nitrogen Steel

2007 ◽  
Vol 14 (5) ◽  
pp. 259-262 ◽  
Author(s):  
Lin ZHAO ◽  
Zhi-ling TIAN ◽  
Yun PENG ◽  
Yan-chang QI ◽  
Yan-jie WANG
Keyword(s):  
Weld Metal ◽  
Heat Input ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Gas Tungsten Arc ◽  
Nitrogen Steel ◽  
Gas Tungsten

scholarly journals The influence of heat input on the toughness and fracture mechanism of surface weld metal

2018 ◽  
Vol 13 ◽  
pp. 2216-2220 ◽  
Author(s):  
O. Popović ◽  
R. Prokić Cvetković ◽  
Lj. Radović ◽  
Z. Burzić ◽  
D. Arsić
Keyword(s):  
Weld Metal ◽  
Heat Input ◽  
Fracture Mechanism
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