1. Available φ 3.2 or φ 4.0 welding rods shall be beveled according to the design requirements of the drawings, and the gap between the butt joints shall generally be equal to the diameter of the silver welding wire. During the welding process, the current shall be similar to or slightly larger than the vertical seam, and the welding rod shall be at an angle of 75-80 degrees with the pipeline.

2. The outer weld of the welding pipe should be welded first, and silver welding wire should be selected. Short arc small oblique circular strips can be used for welding to obtain appropriate penetration depth. The strip speed should be slightly faster to avoid the silver welding wire from melting too much metal and forming weld nodules at a certain point.

During the welding process, in order to prevent undercutting on the weld surface and the flow of metal liquid downwards, the angle between each oblique circle and the weld line should not exceed 45 degrees. When the end of the silver welding wire is transported to the slanted circle, the arc should be short and pause for a moment, then slowly strike the arc to the bottom of the weld seam to avoid various defects and ensure good weld formation.

4. The internal and external welds of the pipeline are basically the same

The cast iron material of the puller claw needs to be spot welded and fixed, and then welded with silver welding wire. Using a cold welding process, it is necessary to weld the groove thoroughly to ensure sufficient tensile strength.

5. It is necessary to perform appropriate surface cleaning before welding, and it is recommended to bevel the welded joint into a U-shaped groove for quality.

6. Drill stop holes at both ends of the crack to prevent crack propagation during welding.

7. If the repair angle is not good, you can choose to use an electric welding rod to form a U-shaped or V-shaped groove through a cold groove.

8. The welding current should be as small as possible, with a moderate arc length and a slight inclination towards the welding direction.

9. It is recommended to use short and thin welding beads and narrow lateral swinging welding torches for the weld bead. Before stopping the arc welding, fill the weld seam and usually do not undergo heat treatment to allow the parts to slowly cool.

Ningbo Yinsheng Welding Materials Co., Ltd. has strong production capacity and product research and development capabilities, with an annual output of over 1000 tons of various brazing materials. At present, the products have reached more than 100 brands and specifications in six major series, including silver welding wire, copper welding rod, brazing rod, copper welding wire, silver copper welding wire, silver welding rod, welding ring, welding ring, welding pad, welding powder, wholesale of silver welding rod, welding ring price, etc. If you have any needs in this regard, please feel free to consult us.