Abstract :
In the SMAW welding process, weaving is one of the important parameters
because it affects the fission properties which will affected the mechanical
properties of the material. This study aimed to identify the comparison of the
tensile strength and microstructure of ST37 steel in SMAW welding among
straight, zigzag and spiral weaving.
The treatment in this study was in the form of welding with the different
weaving using SMAW welding with E7016 electrode and single V preparation
with an angel of 60º. The variations in weaving used were straight, zigzag and
spiral. The material used was ST37 steel which included in the low carbon steel
group with a carbon element of less than 0.3%. The welding tensile was tested
according to ASTM E8 standard and microstructure.
The result indicated that the highest tensile strength occurred in spiral
weaving specimens with an average value 33.94 kgf/mm². Based on the
microstructure test on the welding of spiral weaving indicated the acicular ferrite
microstructure which dominated the entire area and uniformly locked the grain
boundary ferrite microstructure. Acicular ferrite microstructure was
microstructure that was expected from each welding process because this
structure was an interlocking structure that could inhibit crack progaration rate.
In accordance with the results of the study it could be concluded that the
difference in weaving affected the value of tensile strength and formation on the
weld metal microstructure on ST37 steel