Analysis of Welding Groove Configurations on Strength of S275 Structural Steel Welded by FCAW

Year 2018, , 489 - 495, 01.06.2018

Bekir Çevik

https://doi.org/10.2339/politeknik.389642

Cited By: 8

Abstract

The quality of welded joints depends on many factors
such as welding current, voltage, welding speed, shielding gas type, and
welding position. One of these factors is the welding groove design. This is
because different stresses (tensile, compression, bending, etc.) can occur on
the weldments. For this reason, while designing welded constructions, it is important
to join them with the most appropriate welding groove configuration by
considering the stresses the welded joints can be exposed to. In this study,
the effect of the welding groove configuration on the mechanical and
metallurgical properties of S275 structural steel joined by flux cored arc
welding (FCAW) method was investigated. For this purpose, different welding
groove configurations were formed for structural steel sheets. Tensile,
bending, and hardness tests were performed to determine the mechanical
properties of the weldments. In addition, metallographic investigations were
carried out to determine the metallurgical properties of the weld zones. As a
result of the tests, the effect of the welding groove configuration on the
mechanical and metallurgical properties of the welded joints was determined. As
a result of the microstructure studies, different structures such as grain
boundary ferrite, widmanstatten ferrite and acicular ferrite were determined to
form in the weld metal and coarse grained zone. It was determined that hardness
of the weld metal was higher than HAZ and base metal in all welding groove
configurations. As a result of the tensile and bending tests, the highest
tensile and bending strengths were obtained from the samples welded by X₂
type welding groove configuration after the base metal. Furthermore, the X-type
welding groove configurations showed better mechanical properties than the
K-type welding groove configurations. 

Keywords

Flux cored arc welding (FCAW), welding groove, mechanical properties, microstructure

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