An experimental examination of the effect of temperature distributions in different welding sorting of the part transmitting thrust in front loader of tractors by means of MAG method on displacements

Abstract

In this study, temperatures of samples welded by 3 different welding sorting has been measured and displacements occurring on the part after wielding have been determined and an experimental comparison has been made in this regard. The welded part belongs to the front loader used in tractors. Material of the mod-el is S355j2+N. In the experimental study, 3 samples have been welded for each process. In Process 1, welding lines have been observed outside to inside, in Pro-cess 2 inside to outside, and in Process 3 from right to left. For all parts, welding parameters and welding speed have been fixed. Welding manufacture and cool-ing processes have lasted 3000 seconds in total. 4 points have been determined in order to measure the temperature of the part during the experiment. For deter-mination of displacement amount, sample parts have been measured by means of 3-dimensional laser measuring device before and after welding. When results of experiment are examined, it has been observed that temperatures curves are similar in processes no. 1 and 3; and the process has been completed by lower temperature in process no. 2. The highest temperatures measured in processes 1, 2 and 3 are respectively as 380oC, 272oC ve 310oC. Displacements of circular and cylindric points are respectively as 2.17 mm, 1.22 mm, 2.12mm. Maximum displacements of the surfaces are as 0.40 mm, 0.41 mm, 0.80 mm for process 1; as 0.10 mm, 0.28 mm, 0.83 mm for process 2; and as 0.71 mm 0.77 mm 1.39 mm for process 2. It has been concluded that process no. 2 has lower temperatures and less displacements. Less amount of displacement or distortion provides use of parts without applying correction afterwards, and eliminates surplus work-manship and time loss.