Welding is the manufacturing method, which is carried out by joining two similar and dissimilar metals. GMAW welding is one of the most widely used processes in industry. The GMAW welding parameters are the most important factors affecting the quality, productivity and cost of welding. We studied input parameters of welding such as welding current, arc voltage, welding speed, root gap, and output parameter are hardness and tensile strength. This review is based on optimization techniques and analysis tools used by researchers to optimize the parameters. In this research paper, a review has been presented on GMAW welding. The previous literature has been discussed along with the future aspects included in the field of GMAW welding.