Semi-automatic welding guide rail device for gas metal arc welding, control method thereof and welding device

The invention belongs to the technical field of equipment manufacturing, and discloses a semi-automatic welding guide rail device for gas metal arc welding, a control method thereof and a welding device. The invention relates to a semi-automatic GMAW welding tractor and a guide rail device which are installed on a PHC pipe pile static pile pressing machine, are commonly used for GMAW welding pilesplicing construction of end plates of PHC pipe piles of various pipe pile types and can compensate interface position deviation caused by deviation of the center of a pile machine and the center of apipe pile, deviation of welding arc length and deviation of verticality of upper and lower joints. The welding production efficiency of the end plates of the PHC pipe piles is accelerated; installation is based on the static pile pressing machine, disassembly is not needed in use, and the semi-automatic welding guide rail device for gas metal arc welding is suitable for various round pile models;the semi-automatic welding