Pulse burial arc welding process and welding device for boiler membrane type tube panels and tube rows

[0016] The embodiment takes the welding of 38×7 water-cooled wall tubes and fins with a thickness of 9.5 mm as an example.

[0017] like figure 1 Shown is the schematic diagram of the pulse submerged arc welding machine for the boiler membrane tube and screen tube row. 5. The welding wire 6 and the welding tool 7 are composed. Four welding power sources 3 are installed on the upper end of the beam 12 of the welding frame 4, and are connected to the welding machine switch 10 on the welding frame 4. The upper end of each welding power source 3 is provided with an arc The pulse controller 1 is connected to the welding power source 3 through the connection line 2. The lower end of each welding power source 3 is provided with a welding gun. The wire feeding mechanism 5 is installed on the welding frame 4, and the welding wire 6 sent by the wire feeding mechanism 5 passes through each A welding torch is provided with a guide rail 11 at the lower end of the welding frame 4 , two welding tools 7 are placed on the guide rail 11 and can move left and right along the guide rail 11 , and the beam 12 can move forward and backward along the welding frame 4 .

[0018] like figure 2 Shown is the schematic diagram of the arc pulse controller panel. The right side of the arc pulse controller panel can set the peak current and voltage, and the base current and voltage can be set in the middle, and the left side can adjust the pulse frequency and pulse width ratio.

[0019] The welding process of the water wall tube 8 and the fins 9 is as follows:

[0020] (1) According to the product specifications, set the welding current to 470A, the welding voltage to 30V and the welding speed to 1.45m/min on the welding power source;

[0021] (2) On the arc pulse controller 1, adjust the pulse frequency to 45Hz; adjust the pulse width ratio to 50%; adjust the base current and voltage to the "2" position; adjust the peak current and voltage to the "6" position;

[0022] (3) Put the water-cooled wall tube 8 and the fins 9 on the guide rail 11 of the welding frame 4, adjust the position between the water-cooled wall tube 8 and the fins 9, and move the welding tool 7 on both sides to the water-cooled wall tube 8. Clamped with fin 9;

[0023] (4) Move the beam 12 to the end of the water-cooled wall tube 8, and adjust the angle of the welding torch welding wire 6 of the pulse submerged arc welding machine of the boiler membrane tube screen tube row to about 75-80°;

[0024] (5) Start the welding machine switch 10 button, start welding, and move the beam 12 while welding until the whole water-cooled wall tube 8 is welded.

[0025] Performance comparison:

[0026]