Gas shield welding method for steel plate with yield strength of 1300MPa and welding part

The invention discloses a gas shield welding method for steel plates with the yield strength of 1300MPa and a welding part, and the method comprises the following steps: carrying out V-shaped groove processing on a first steel plate and a second steel plate to obtain a first base material and a second base material, and the angle of a single-side groove of each of the first base material and the second base material is 30 degrees; the root gap between the first base material and the second base material is 1-1.5 mm; the first steel plate and the second steel plate are respectively and independently 8-25mm, and the yield strength is greater than or equal to 1300MPa; the first base material and the second base material are preheated to 120-150 DEG C correspondingly, and the preheated first base material and the preheated second base material are obtained; the first base metal and the second base metal are subjected to gas shield welding treatment, and a welding part containing the first base metal and the secon