Narrow gap laser-TIG arc hybrid welding apparatus and method

A narrow gap laser-TIG (tungsten inert gas) arc hybrid welding apparatus, comprising a welding gun body, a swing welding gun assembly, a welding wire feeding and heating assembly, and a gas conveying assembly, wherein the swing welding gun assembly comprises a welding gun rotating shaft, a stepper motor, a large gear, a pinion, an upper insulating sleeve, a lower insulating sleeve, a tungsten electrode clamp, and a tungsten electrode;

• the stepper motor is mounted on a motor connection seat, the pinion is mounted on an output shaft of the stepper motor, the large gear is mounted on the welding gun rotating shaft, and the pinion is engaged with the large gear;
• the welding gun rotating shaft is mounted and positioned on the welding gun body by means of the upper insulating sleeve and the lower insulating sleeve;
• and the tungsten electrode is mounted at a tail end of the welding gun rotating shaft by means of the tungsten electrode clamp;
• the welding wire feeding and heating assembly comprises a hot wire connection seat, a conductive connecting rod, an upper insulating base, a lower insulating base, a wire guide tube, a contact tip connection seat, and a contact tip;
• an upper end of the conductive connecting rod is connected to the hot wire connection seat, and a lower end of the conductive connecting rod is connected to the contact tip connection seat;
• the contact tip is mounted on the contact tip connection seat;
• the conductive connecting rod is mounted at a left side of the welding gun body by means of the upper insulating base and the lower insulating base;
• the wire guide tube is mounted on the upper insulating base, a tail end of the wire guide tube is connected to the contact tip, and the hot wire connection seat is connected to a hot wire power cable;
• the wire guide tube is clamped and positioned on the upper insulating base by means of a retaining clamp, and the retaining clamp is used to adjust a feeding position of a welding wire;
• a TIG welding arc generated by the tungsten electrode and a focus point of a laser beam intersect at a place, and together act on a same region;
• the gas conveying assembly comprises a left gas guide tube and a right gas guide tube, the left gas guide tube and the right gas guide tube are both mounted on the welding gun body and arranged on left and right sides of the welding gun rotating shaft;
• tail ends of the left gas guide tube and the right gas guide tube are respectively arranged corresponding to left and right gas chambers at a lower end of the welding gun body, and a gas screen is arranged in each gas chamber, and a welding shielding gas is conveyed to the left and right gas chambers at the lower end of the welding gun body through the left gas guide tube and the right gas guide tube, and then are conveyed to a welding arc region by means of the gas screens.