Effect of laser-arc hybrid welding process on carbon steel welds back formation

Abstract The aim of this work is to evaluate the effectiveness of fiberglass and ceramic fiber cylinders as root-pass weld backing for a double-V groove in 16 mm-thick carbon steel. Three different cylinder diameters were tested: 4.8, 9.5 mm (fiberglass) and 6.4 mm (ceramic fiber). The welding process used was GMAW. The welding technique and the following process variables were investigated: root opening, current and travel speed. The results show that cylindrical fiberglass and ceramic fiber backings not only have excellent refractory properties, but also seal the root opening and contain the weld pool sufficiently to produce a root bead free of discontinuities and with a satisfactory shape and geometry. Working points were defined, together with a possible operating range for the welding parameters. It was concluded that cylindrical fiberglass and ceramic fiber weld backings hold great promise for use in root-pass welds in double-V grooves in applications in the naval and metallurgical industry.

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Microstructural aspects of hydrogen stress cracking in seawater for low carbon steel welds produced by flux-cored arc welding

Materials Science and Engineering A ◽

10.1016/j.msea.2021.141568 ◽

2021 ◽

pp. 141568

Author(s):

Hanji Park ◽

Cheolho Park ◽

Junghoon Lee ◽

Hyunbin Nam ◽

Byungrok Moon ◽

...

Keyword(s):

Carbon Steel ◽

Arc Welding ◽

Low Carbon Steel ◽

Low Carbon ◽

Stress Cracking ◽

Flux Cored Arc Welding ◽

Steel Welds

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Observation of Arc Behaviour in TIG/MIG Hybrid Welding Process

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/596/1/012025 ◽

2020 ◽

Vol 596 ◽

pp. 012025

Author(s):

Rose Alifah Ellyana Roslan ◽

Sarizam Mamat ◽

Pao Ter Teo ◽

Firdaus Mohamad ◽

Srinath Gudur ◽

...

Keyword(s):

Welding Process ◽

Hybrid Welding

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Investigation on the microstructure—mechanical property correlation in dissimilar steel welds of stainless steel SS 304 and medium carbon steel EN 8

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2018.10.018 ◽

2018 ◽

Vol 36 ◽

pp. 281-292 ◽

Cited By ~ 14

Author(s):

Dilip Kumar Singh ◽

Gadadhar Sahoo ◽

Ritwik Basu ◽

Vikram Sharma ◽

M.A. Mohtadi-Bonab

Keyword(s):

Mechanical Property ◽

Stainless Steel ◽

Carbon Steel ◽

Medium Carbon Steel ◽

Medium Carbon ◽

Dissimilar Steel ◽

Property Correlation ◽

Steel Welds ◽

Ss 304

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The Effect of AC (alternating current) and DC (direct current) on Bend Testing Results of Low Carbon Steel Welding Joints

Teknomekanik ◽

10.24036/teknomekanik.v3i2.6272 ◽

2020 ◽

Vol 3 (2) ◽

pp. 56-61

Author(s):

Zetri Firmanda ◽

Abdul Aziz ◽

Bulkia Rahim

Keyword(s):

Carbon Steel ◽

Direct Current ◽

Low Carbon Steel ◽

Welding Process ◽

Alternating Current ◽

Bend Test ◽

Open Crack ◽

Low Carbon ◽

Bend Testing ◽

Welding Joints

The purpose of this study was to determine the effect of alternating current (AC) and direct current (DC) on the bend testing results of low carbon steel welding joints. The results of this study are expected to determine the cracks that occur from the root bend and face bend testings in the AC and DC welding process. This study used experimental method, where the research was done by giving AC and direct polarity DC (DC-) SMAW welding treatments. The material used in this research was low carbon steel plate DIN 17100 Grade ST 44, thickness 10 with E7016 electrode type. The process of welding joints used a single V seam, strong current of 90A, and the welding position of 1G. The testing of welding joints was carried out by bend testing using the standard acceptance of AWS D1.1 root bend and face bend testing results. The results of the bend testing showed that the AC welding root bend test specimen held no cracks while the DC welding root bend test held cracks with incompelete penetration and open crack defects. On the contrary, the AC welding face bend test had open crack defects and in the DC welding face bend test was found a crack. Thus, there was a difference in the crack resistance of the welding joint from the types of current used through the root bend test and face bend test. Therefore, it can be summarized that AC welding is better for root welding and DC welding is good for capping welding.

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Evaluation of induced residual stresses on AISI 1020 low carbon steel plate from experimental and FEM approach during TIG welding process

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES ◽

10.15282/jmes.13.1.2019.06.0376 ◽

2019 ◽

Vol 13 (1) ◽

pp. 4415-4433

Author(s):

I. B. Owunna ◽

A. E. Ikpe

Keyword(s):

Carbon Steel ◽

Residual Stresses ◽

Steel Plate ◽

Low Carbon Steel ◽

Welding Process ◽

Service Condition ◽

Tig Welding ◽

Von Mises Stress ◽

Low Carbon ◽

Temperature Range

Induced residual stresses on AISI 1020 low carbon steel plate during Tungsten Inert Gas (TIG) welding process was evaluated in this study using experimental and Finite Element Method (FEM). The temperature range measured from the welding experimentation was 251°C-423°C, while the temperature range measured from the FEM was 230°C-563°C; whereas, the residual stress range measured from the welding experimentation was 144MPa-402Mpa, while the residual range measured from the FEM was 233-477MPa respectively. Comparing the temperature and stress results obtained from both methods, it was observed that the range of temperature and residual stresses measured were not exactly the same due to the principles at which both methods operate but disparities between the methods were not outrageous. However, these values can be fed back to optimization tools to obtain optimal parameters for best practices. Results of the induced stress distribution was created from a static study where the thermal results were used as loading conditions and it was observed that the temperature increased as the von-Mises stress increased, indicating that induced stresses in welded component may hamper the longevity of such component in service condition. Hence, post-weld heat treatment is imperative in order to stress relieve metals after welding operation and improve their service life.

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