Abstract
Many factors affect the welding results including electrode movement, welding current and electrode type. This study aims to determine the effects of electrode movements on SMAW welding to the quality of ST-37 steel welds. The quality reviewed includes microstructure, tensile strength, yield stress and weld defects. The study used ST 37 Steel with thickness 10 mm and a size of 100 mm x 200 mm, open V seam with an angle of 600 degree. E 7016 series electrodes had a diameter of 3.2 mm. Welding current 90-92 amperes, polarity DC +, welding voltage 25 volts and travel speed 8-10 cm / minute. Electrode movements variations include straight, zig-zag and spiral movement. The results showed that the micro structure of the Acicular Ferrite (AF) on the electrode spiral movement looks uniform, tight, dominates the area, the spiral movement of the electrode provides the highest tensile strength and the highest yield strength and the electrode spiral movement does not produce welding defects
Highlights
This study aims to determine the effects of electrode movements on SMAW welding to the quality of ST-37 steel welds
The results showed that the micro structure of the Acicular Ferrite (AF) on the electrode spiral movement looks uniform, tight, dominates the area
Perbandingan variasi gerakan elektroda pada proses shielded metal arc welding (smaw) terhadap struktur mikro dan kekuatan bending baja Karbon rendah (Doctoral dissertation, Universitas Negeri Semarang)
Summary
Nur Akhmad Triwibowo, Eka Supriatna Struktur mikro lasan dengan gerak lurus elektroda (Gambar 5) terlihat struktur mikro lasan yang terdiri dari Grain Boundary Ferrite (GF), Widmanstatten Ferrite (WF) dan Acicular Ferrite (AF). Struktur mikro GF dan AF terlihat merata hampir di seluruh bagian. Namun demikian struktur mikro WF terlihat hanya di beberapa bagian. Struktur Mikro Lasan Dengan Gerak Zig-zag Elektroda Struktur mikro lasan dengan gerak zig-zag elektroda (Gambar 6) terlihat struktur mikro Grain Boundary Ferrite (GF), Widmanstatten Ferrite (WF) dan Acicular Ferrite (AF). Struktur mikro WF terlihat hanya sedikit di bagian kecil dari area tersebut. Struktur mikro AF terlihat berbutir lembut dan mendominasi area, sedangkan struktur mikro GF terlihat kecil dan lebih sedikit dibanding GF yang ada pada Gambar 5
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