Effect of welding environment on fatigue crack growth rate of aluminium alloy 1100

Purpose: Aluminium is a light metal that is widely used in industry because it has good machinability, good corrosion resistance has good machinability, good corrosion resistance, and high ductility. In its application to the vehicle structure, the welding process requires a connection process. However, aluminium welding has several problems because aluminium has high thermal conductivity, a large coefficient of expansion, specific gravity and a low melting point. So, this study aims to determine the difference in fatigue crack growth rate of welded joints from different welding environmental conditions such as air humidity and air temperature. Design/methodology/approach: Fatigue crack growth rate on Al 1100, which is welded using Metal Inert Gas (MIG) welding in an isolated welding room and controlled relative humidity and temperature parameters during the welding process. Findings: A fatigue crack growth rate increases as the welding chamber's humidity and air temperature parameters decrease. A large amount of porosity, transgranular fatigue crack growth behaviour, and quasi-cleavage fault morphology occurred at high welding chamber temperature and humidity due to the influence of hydrogen and oxygen in the welding process. Research limitations/implications: It is recommended to continue to study the characteristics of the fatigue crack growth rate characteristics of other materials or dissimilar metal joints in a controlled welding room with various other parameters. Practical implications: As information and material for consideration for similar research, design a good aluminium welding chamber to minimise defects in welded joints. Originality/value: The originality of the article shows the results of experimental data on the study of FCGR characteristics and fracture characteristics of Al-1100 welding joints in a controlled welding room.