Abstract
The use of 3D printing methods in the industry is becoming more frequent and popular. It brings specific economic effects, enables quick and precise production of machine parts and devices. The article presents a fragment of research carried out in the Welding Engineering Department of the Warsaw University of Technology on the application of MAG arc welding for 3D printing. The MAG method was used to try to produce thin walls. The aim of the presented research was to determine the effect of the cooling method on shortening the time of manufacturing the 3D model of thin walls. The models were made using G3Si1 and 316LSi electrode wires. In the first part of the research,an interpass temperature of 50 °C, 100 °C and 150 °C, achieved by free cooling was adopted. In the second part, the interpass temperature was 100 °C and was achieved by forced cooling with a copper plate, a fan and a stream of compressed air. The greatest reduction in the time of manufacturing the 3D model of a thin wall was obtained for cooling using compressed air.
Highlights
Among numerous methods of 3D forming, there are techniques using welding heat sources [2]
In the work carried out in the Welding Engineering Department of the Warsaw University of Technology, arc welding is applied with a consumable electrode in the shielding of MIG/ MAG protective gases [5÷7]
The procedure of making the 3D models included: – surfacing successively eight buffer layers in order to reduce the influence of undercoats and the tooling base on heat absorption from the created 3D model; – surfacing of successive layers with simultaneous temperature measurement by means of a pyrometer and thermocouple; the total number of layers was from 18 to 30; – temperature measurement using a thermocouple in a blind hole drilled in the eighth layer in the middle of its length; – temperature measurement by means of a pyrometer aimed at the face of the current layer in the middle of its length; the pyrometer’s lens was located at a distance of 350 mm, with the optical axis deflected by about 30° from the vertical
Summary
Among numerous methods of 3D forming, there are techniques using welding heat sources [2]. The advantages of the method include a wide range of surfaced materials, high efficiency, the ability to robotize the process and its easy control, the availability of equipment and a relatively low cost. The potential of the MIG/ MAG method raises due to a number of its functional varieties, including low-energy ones. An interesting example is the CMT (Cold Metal Transfer) variety, developed in 2004 by Fronius [8]. It is characterized by high stability, reduction of splash and repeatability of the obtained effect
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