Welding technology is widely used in the manufacturing industry and its significance is given greater emphasis because welding technology is directly related to the quality and productivity of the product. However, the interest in the welding is very low because it is known as one of the 3D works.
Korea has the high consumption of steel ranks and it ranks fifth in the world. It means the higher importance of welding technology compared to other developed or advanced countries.
Shipbuilding industry is normally using the traditional DC arc welding machine which is controlled with SCR by analog method. Recently a digital arc welding machine has been developed and its application is growing gradually. The power consumption of digital welding machine can be markedly reduced and its welding quality can be also improved very much.
In this study, a lot of welding experiment using digital welding machine were carried out and their results were evaluated by observing arc state and analysing the signal of welding current and voltage. On the basis of this work the relationship of welding parameters and welding results was investigated and the suitable welding condition was proposed for the horizontal fillet FCAW which is most widely used in shipbuilding industries. Finally the DB program was made to easily get the suitable welding conditions.