Investigation of Temperature History, Porosity and Fracture Mode on AA1100 Using the Controlled Intermittent Wire Feeder Method

Abstract

In this study, the effect of variation of intermittent wire feeding method on thermal histories during the welding process, the physical appearance, mechanical properties, and fracture mode was investigated. The configuration parameter of wire feeding was determined by the properties of the so-called length ratio (RL). It was influenced by welding speed, wire feeding speed, feeding time, and delaying time. Bigger value of length ratio tends to have a smaller bead width with a higher cap. Also, a larger ratio tends to have bigger tensile strength and the fracture location close to the weld bead.

Weld Geometry, Mechanical Properties, Microstructure and Chemical Composition of AA6063 in Tungsten Inert Gas Welding with Intermittent Controlled Wire Feeding Method

“…This research is a continuation of the previous study by Ario [2,12], and the results show that the parameters of the intermittent wire feeder ratio of 4-6 resulted in good mechanical, microstructure and mixing properties between the base metal and wire feeder. The results of this study will show, from the weld geometry formed (top bead width and bottom bead width), the mechanical properties (tensile test and material hardness test), chemical composition between the base metal and wire feeder, and the microstructure.…”

“…This is because in the welding above, the given heat input is still occurring, but the amount of filler metal given is different. At the greatest speed of the feed wire, it reduces the aluminum alloy's penetration, resulting in the width of the bead getting smaller [2,12]. Changing the variation in the feed time ratio and delay time can also affect the top and back bead width, but the effect is not significant.…”

“…The effect of ratio variation did not significantly affect the historical temperature of the HAZ region. Preheating was needed to approach the base material and wire feeder's melting point so that it could be mixed homogeneously [12]. The temperature increase also affects TBW and BBW, as shown in Figure 6b was an example of the ratio 4 with a wire feeder speed of 8 mm.s −1 .…”

“…With this arrangement, the TIG welding process can be used on thin steel plates or thick steel plates [2]. Therefore, this welding has been widely applied to various metals, including aluminum [12]. Several researchers have developed the wire feed method or the WAAM method for aluminum and its alloys.…”

“…The results showed that the microstructure consists of a eutectic silicon aluminum dendritic internetwork in an aluminum solid solution matrix because the AA-4047 infill wire contains a lot of silicon [14]. Further development of the intermittent controlled wire feeding method was carried out by varying the length of the feed time and delay time and the speed of the feed wire by Ario [12]. The AA1100 series aluminum was applied to the research, and the results showed that increasing the length ratio increased the porosity and increased the tensile strength.…”