EFFECT OF WELDING POSITION ON THE MECHANICAL PERFORMANCE OF MANUAL METAL ARC WELDELD JOINTS VIA ANALYSIS OF VARIANCE

Rui Rosa De Morais Júnior,Marcelo Xavier Guterres,Alexandre Ferreira Galio,Henara Lillian Costa

doi:10.21575/25254782rmetg2019vol4n6717

Rui Rosa De Morais Júnior, Marcelo Xavier Guterres + Show 2 more

Open Access

https://doi.org/10.21575/25254782rmetg2019vol4n6717

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Abstract

Positional welding is a common challenge in many manufacturing practices and the welding position can affect the mechanical properties of welded joints during manual metal arc welding. This work uses tensile tests to investigate the mechanical properties of welded joints, aiming to test the hypothesis of the influence of welding position on tensile strength, total displacement before rupture and plastic displacement before rupture. This hypothesis was tested for three different coated electrodes (AWS E6010, AWS E6013 and AWS E7018) and three welding positions (1G, 3G and 4G), accounting for nine types of specimens. For each type of specimen, ten repetitions were carried out. Analysis of Variance (ANOVA) was used to test the hypotheses. The welded joints using the welding position 1G presented higher rupture load and larger total displacement before rupture than the other positions.

Highlights

Welding is a key manufacturing process in applications such as joining, cutting and recovery of mechanical components
The nine welding conditions are the result of the following combinations: E6010 electrode / 1G position (Figure 5a), E6010 electrode / 3G position (Figure 5b), E6010 electrode / 4G position (Figure 5c), E6013 electrode / 1G position (Figure 5d), E6013 electrode / 3G position (Figure 5e), E6013 electrode / 4G position (Figure 5f), E7018 electrode / 1G position (Figure 5g), E7018 electrode / 3G position (Figure 5h), and E7018 electrode / 4G position (Figure 5i)
Average values and standard deviation values were calculated for all the variables yi,j, shown in Tables 2 to 4, respectively

Summary

Introduction

Welding is a key manufacturing process in applications such as joining, cutting and recovery of mechanical components. This broad range of applications implies that welding can be carried out under different environments, in elevated structures or even submerged in water (WAINER; BRANDI; MELLO, 2010). The component cannot be removed for welding, so that the welder needs to adapt the welding practice to the convenient welding position. Welding positions are classified as plane, horizontal, vertical and overhead. In manual metal arc welding (MMAW), welding position has a strong influence on the productivity and easiness of the welding operation (MASOUMI; SHAHRIARI, 2010). According to the American Society of Mechanical Engineers (ASME, 2010), the welding positions in butt welding are designated by one digit followed by one letter, so that the plane, horizontal, vertical and overhead positions are designated as 1G, 2G, 3G and 4G, respectively (Figure 1)

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