Friction plug welding (FPW) does not require the use of external heat or the joining of molten materials to join two unlike or comparable materials. Because no melting takes place throughout the process, friction welding is more of a fake than a true fusion welding technique. By interpolating heat sources or preheating the work piece surface, joins can be made more effective. The friction coefficient must also be taken into account when calculating the heat flux produced at the mean surface. By adjusting the plug's diameter and watching how the temperature distribution is impacted, one may alter the width of the land. By using mathematical and analytical model formulas, it is possible to determine the impact of pre-heating. The temperature distribution values were calculated for a variety of plug sizes and pre-heating temperatures ranging from 2500C to 5500C. The values were determined even while the work piece was in operation. It was chosen to employ the response surface analysis technique in this study to examine the impact of different factors on the tensile strength of friction plug welding (FPW) joints composed of 6082 aluminium alloy. The temperature field and the force analysis have been used to explain why the joint's root seems to be a weak zone. Why this appearance appeared was explained. The rotating speed was shown to be more important than the upsetting speed and welding duration in influencing the tensile strength of FPW joints.