GMAW용접에서 와이어의 돌출길이와 전류 및 전압이 알루미늄 재료에 미치는 영향

Effects of the Projected length of Wire, Electric Current and Voltage about the Aluminum Material in the GMAW

As the industrial environment is changed rapidly, organized welding method about nonferrous metals is needed. Taking the advantages of Aluminum that is light and no risk of corrosion, Aluminum has been used for the area of automobile, aircraft, shipbuilding and so forth. Therefore it is unavoidable tendency to weld using Aluminum material. The most important flaw is welding cracks that happen on Aluminum welding. These are high temperature cracks, and they are mainly occurred by segregation of alloyed element in crystal particles or existence of low melting point substance. Blow holes are easier to happen than other metals, Hydrogen is informed as the direct cause of blow holes. Aluminum is easy to be influenced by oxygen of humidity as long as add some heat from outside, so it is difficult to weld and changes its form easily. We welded on this Aluminum material by changing projected length and checked the point to get excellent welding at how much distance. For this study we used pure Aluminum material and Alloy ER 4043 φ1.2 welding rod, also automatic feed mechanism and 500A GMAW machine are used for accurate and stable welding. After welding, we seized internal defects through nondestructive testing and operated hardness test on welding part. After that, we endeavored to look for the conditions by measuring the changes of penetration. Through this study we gained the result about what changes happen on Aluminum material by the difference of projected length, electric current, and voltage in GMAW welding.