Weld seam structure and welding process suitable for a narrow-gap water-cooled wall tube panel

A welding process for a narrow-gap water-cooled wall tube panel, comprising the following steps:

• Step 1:
• processing water-cooled wall tubes (16) to form welding joints, processing a gap between adjacent water-cooled wall tubes (16) to make it form a groove-type gap, and then polishing surfaces of the water-cooled wall tubes (16) until metallic luster is exposed;
• Step 2:
• baking a welding electrode to a target temperature, and then placing the welding electrode in an electrode heat-insulating barrel for use;
• Step 3:
• preheating the water-cooled wall tubes (16) to make all parts of materials to be welded heated uniformly;
• Step 4:
• placing the water-cooled wall tubes (16) on a welding device, such that the groove-type gap is formed between the adjacent water-cooled wall tubes (16), and then welding the water-cooled wall tubes (16);
• Step 5:
• heating weld seams and heat-affected zones of the water-cooled wall tubes (16) with a heating torch to achieve the purpose of hydrogen removal;
• and
• Step 6:
• performing non-destructive testing on the weld seams after the hydrogen removal is completed;
• where the welding device comprises:
• a base plate (1), where a cavity (22) is arranged in a middle part of the base plate (1), a number of first support bases (14) are arranged at uniform intervals in the cavity (22) along a front-rear direction, a first support groove (15) is arranged at an upper end of each first support base (14), a number of telescopic rods (10) are arranged at uniform intervals along the front-rear direction on a left side of an upper end of the base plate (1), the number of telescopic rods (10) and the number of first support bases (14) are arranged in one-to-one correspondence, each telescopic rod (10) is fixedly connected with a connecting block (11), the connecting block (11) is slidably connected with a second support base (17), a second support groove (18) is arranged at a lower end of the second support base (17), the second support groove (18) correspondingly communicates with the first support groove (15), an upper end of the second support base (17) is connected with a fixed block (13), a spring (12) is fixedly arranged between the fixed block (13) and the connecting block (11), a number of sliding blocks (19) and a number of positioning holes (21) are arranged at uniform intervals along the front-rear direction on a right side of the upper end of the base plate (1), each sliding block (19) is slidably connected with the fixed block (13) along an up-down vertical direction, the sliding block (19) and the telescopic rod (10) are slidably connected along the front-rear direction of the base plate (1), a fixed shaft (20) is fixedly arranged in the sliding block (19), one end of the fixed shaft (20) is rotatably connected with the first support base (14), a threaded hole (23) is arranged on a side of the fixed shaft (20) away from the first support base (14), the threaded hole (23) is threadedly connected with a threaded rod (24), and the threaded rod (24) is correspondingly matched with the positioning hole (21);
• and
• a weld seam structure of the narrow gap water-cooled wall tube panel comprises the groove-type gap formed between the adjacent water-cooled wall tubes (16), wherein the welding joints are arranged on sides of the adjacent water-cooled wall tubes (16) that are close to each other, the welding joints are distributed on an upper side of the groove-type gap, and the welding joints communicate with the groove-type gap.