ON THE EFFECT OF HEAT INPUT ENERGY ON THE WIDTH OF FUSION LINE IN T-JOINTS MADE WITH PROGRAM-CONTROLLED PROJECTION WELDING

2021 ◽  
pp. 88-95
Author(s):  
Sergei Mikhailovich Furmanov ◽  
Dmitry Ivanovich Yakubovich ◽  
Dmitry Nikolayevich Yumanov ◽  
Leonid Sergeyevich Malashenko ◽  
Igor Andreyevich Naymovets
Keyword(s):  
Heat Input ◽  
Fusion Line ◽  
Input Energy ◽  
T Joints ◽  
Projection Welding

scholarly journals Construction of productivity windows for fillet welds using the FCAW process for thin ship panel manufacturing

2019 ◽  
Vol 12 (24) ◽  
pp. 17
Author(s):  
Styvens Hernandez Palacio ◽  
Mateo Cardona Castaño ◽  
Jorge E. Giraldo Barred
Keyword(s):  
Heat Input ◽  
Filler Metal ◽  
Fillet Welds ◽  
Welding Parameters ◽  
Horizontal Position ◽  
Trial And Error ◽  
T Joints ◽  
Acceptable Quality ◽  
A36 Steel ◽  
Wire Feed

The FCAW process used filler metal E71T-11 of Ø0.035” to apply fillet welds with a size of ~4mm on T-joints made of ASTM A36 steel, in a horizontal position, using 42 appropriate combinations of wire feed speeds -WFS- (between 50 and 540 ipm), voltages (13-33V) and welding speeds (4.2-24.5 ipm). The test welds applied with each combination were inspected visually and by macro-attack to establish their compliance with the acceptance criteria for naval panels provided by the American Bureau of Shipping - ABS. With these results, Voltage vs. WFS, Voltage vs. Amperage and Heat Input vs. WFS graphs were constructed, and productivity windows were drawn over them including the combinations of welding parameters capable of producing welds of acceptable quality. The productivity windows obtained with this method, called ARCWISE, allow proper welding parameters to be selected during the design of WPSs avoiding iterative processes of trial and error.

ON THE EFFECT OF PARAMETERS OF RESISTANCE PROJECTION WELDING MODE WITH PROGRAMMED CONTROL OF HEAT INPUT POWER ON THE STABILITY OF STRENGTH INDICATORS OF JOINTS

2020 ◽  
pp. 118-129
Author(s):  
Dmitry Nikolayevich Yumanov ◽  
Sergei Mikhailovich Furmanov ◽  
Ivan Nikolayevich Smolar ◽  
Irina Dmitrievna Kamchitskaya ◽  
Artur Olegovich Koroteyev
Keyword(s):  
Heat Input ◽  
Input Power ◽  
Projection Welding ◽  
The Stability

Research on Welding Repair for Reheating Hot Pipe Elbow of 325MW Station Boiler

2012 ◽  
Vol 516-517 ◽  
pp. 414-418 ◽  
Author(s):  
Xiang Feng Zheng ◽  
Qing Wang ◽  
Yan Ting Feng ◽  
Xiao Guang Niu ◽  
Xiao Jun Hao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Base Metal ◽  
Heat Input ◽  
Welding Residual Stress ◽  
Fusion Line ◽  
Metallographic Examination ◽  
Microscope Analysis ◽  
Metal Material ◽  
Pipe Elbow

Through methods, such as microscope analysis, metallographic examination, the crack located nearby the fusion line between reheating hot pipe elbow and blocking valve is reheat crack. The base metal material and excessive welding residual stress are the primary inducement of crack. In replacing pipe elbow, the measures of reducing residual stress, such as hammer blowing ,lower welding heat input, post welding heat treatment and so on, were taken. The welding repair succeeded greatly.

scholarly journals Heat Input Energy For Arc Plasma

1966 ◽  
Vol 35 (3) ◽  
pp. 215-224
Author(s):  
Kimiyuki Nishiguchi
Keyword(s):  
Heat Input ◽  
Input Energy ◽  
Arc Plasma

Experimental evidence on structural adequacy of high strength S690 steel welded joints with different heat input energy

2020 ◽  
Vol 204 ◽  
pp. 110051 ◽  
Author(s):  
Kwok-Fai Chung ◽  
Ho-Cheung Ho ◽  
Yi-fei Hu ◽  
Kai Wang ◽  
Xiao Liu ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Welded Joints ◽  
Heat Input ◽  
High Strength ◽  
Input Energy

scholarly journals Stability and Heat Input Controllability of Two Different Modulations for Double-Pulse MIG Welding

2019 ◽  
Vol 9 (1) ◽  
pp. 127 ◽  
Author(s):  
Jiaxiang Xue ◽  
Min Xu ◽  
Wenjin Huang ◽  
Zhanhui Zhang ◽  
Wei Wu ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Heat Input ◽  
Double Pulse ◽  
Fish Scale ◽  
Input Energy ◽  
Mig Welding ◽  
Pulse Modulation ◽  
Welding Arc ◽  
Input Control ◽  
Welding Processes

Aluminum alloy welding frequently experiences difficulties such as heat input control, poor weld formation, and susceptibility to pore generation. We compared the use of two different modulations for double-pulse metal inert gas (MIG) welding to reduce the heat input required to generate oscillations in the weld pool. The stabilities of rectangular wave-modulated and trapezoidal wave-modulated double-pulse MIG welding (DP-MIG and TP-MIG) were analyzed by examining their welding processes and weld profiles. We found that the transitional pulse in TP-MIG welding results in smoother current transitions, softer welding arc sounds, and a highly uniform fish-scale pattern. Therefore, TP-MIG welding is more stable than DP-MIG welding. The effects of these double-pulse modulation schemes on welding input energy are presented. We propose methods for reducing welding input energy by varying the number of pulses or the pulse base time of low-energy pulse train while keeping the welding current and welding arc stable and unchanged. Compared to DP-MIG welding, TP-MIG welding reduces the input energy by 12% and produces finer grain sizes, which increases weld hardness. Therefore, TP-MIG welding offers a new approach for heat input control in DP-MIG welding of aluminum alloys. The results of this work are significant for aluminum alloy welding.

Investigations on Impact Toughness and Microstructure Characteristics of Gas Metal Arc Welded HY-80 Steel Plate

2019 ◽  
Vol 964 ◽  
pp. 68-79 ◽  
Author(s):  
Herry Oktadinata ◽  
Winarto Winarto ◽  
Eddy S. Siradj
Keyword(s):  
Impact Toughness ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Arc Welding ◽  
Steel Plate ◽  
Gas Metal Arc Welding ◽  
Hardness Test ◽  
Fusion Line ◽  
High Yield ◽  
The Impact

HY-80 is the high yield steel that commonly used for naval ship and submarine. Arc welding operations are critical stage in fabrication of this steel. During welding, the problem may occur in the heat affected zone due to the high temperature makes the microstructure suddenly changes. Coarse grain heat affected zone (CGHAZ) develops close to the fusion line, steel become brittle and the impact toughness decrease. This research investigated the microstructure of HY-80 weldment, impact toughness at sub-zero temperatures, and hardness distribution along cross-section of the welded joint. ER100S welding wire, Ar+10%CO2 shielding gas mixture and single V-groove butt joint with an angle of 60° were selected prior to welding. 12 mm thick of HY-80 steel plate that used in this experiment was multipass welded by gas metal arc welding (GMAW). Impact toughness at sub-zero temperature, hardness and microstructure evolutions of base metal (BM), heat affected zone (HAZ) and weld metal (WM) were observed. The result shows at a temperature of-80 °C, the lowest impact toughness was measured at WM (61 J) as compared to fusion line (101 J) and BM (217 J). The hardness measurement shows the maximum hardness was measured in CGHAZ followed WM and BM. Vickers hardness test result of weld joint at bottom area are higher than top area. It may caused of the low heat input of back weld compared to other passes. The lower heat input, cooling rate increased and initiate the formation of hard phase. The microstructure of WM shows acicular ferrites and non-metallic inclusions, these inclusions may deteriorate the impact toughness.

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

Dependence of Cold Cracks Formation from the Heat Input when Welding of High Strength Steel with Yield Strength of 500 MPa

2019 ◽  
Vol 946 ◽  
pp. 934-938
Author(s):  
M.A. Ivanov ◽  
A.G. Alruhaimi ◽  
S.I. Voronin
Keyword(s):  
Yield Strength ◽  
Ambient Temperature ◽  
Heat Input ◽  
High Strength Steel ◽  
Weld Seam ◽  
High Strength ◽  
Steel Grade ◽  
Input Energy ◽  
Main Criterion ◽  
Ambient Temperatures

The weldability of high strength steel of grade 10G2FBY with a yield strength of 500 MPa is conducted in this paper according to the criterion of cold cracks formation in the seam root of plates with a thickness of 18 and 36 mm. The study was carried out in accordance with GOST 26388-84 on samples of type IX at ambient temperatures from –20 to +20 °С at heat input energy from 5.8 to 14.3 kJ/cm. After welding, the plates were cooled in the air for 24 hours. The main criterion for assessing weldability is the presence or absence of cold cracks after welding. The welding was made with a soft wire 4Y42 with a yield strength of 420 MPa. Cold cracks in high strength steel 10G2FBU for thicknesses of 18 and 36 mm are not detected in heat input over 10.3 kJ/cm by welding at the temperature of +20 °С, at the same time when welding at an ambient temperature of -20 °С cracks are not detected when running over energy of 14.7 kJ/cm. Critical cooling rate in which no cracks appeared was 55 °С/s at the temperature of welding +20 °С, and it was 44 °С/s at a temperature of welding –20 °С for both thicknesses. The criterion HVmax<300 HV is a necessary but insufficient condition for the prevention of cold cracking in steels of the type 10G2FBU. In the conditions of the experiment, cold cracks in the weld seam are absent at a hardness of no more than 250-260 HV, which is probably due to the presence of diffusive hydrogen, which is not regulated in the regulations for the supply of this steel grade

ON THE REGULATION OF HEAT INPUT INTO THE AREA BETWEEN THE ELECTRODES IN CONTACT PROJECTION WELDING OF LAP JOINTS

2016 ◽  
pp. 48-59
Author(s):  
Andrei Yuryevich Polyakov ◽  
Sergey Mikhailovich Furmanov ◽  
Dmitry Ivanovich Yakubovich ◽  
Arseniy Mikhailovich Kurlenkov
Keyword(s):  
Heat Input ◽  
Lap Joints ◽  
Projection Welding
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