Required equipment
A set of manual electric welding equipment, a handle angle grinder, an electric hammer, and a plane ruler.
Preparation before welding
1. Check and debug the equipment to ensure the normal operation of the equipment; 2. To prepare the φ4.0J402 electrode, it is best to dry it at 300℃-350℃ for one hour.
Welding process
1. Assembly Assemble the cone and the large flange according to the drawing requirements, and then divide the large flange into 8 equal parts. 2. Welding Because the flange is thicker and the groove is larger, segmented symmetrical and multilayer welding is adopted.
Weld quality
The weld strength is required to reach at least the strength of the base metal. The surface of the welding seam is flat and smooth, and there are no defects such as burn through, pores, weld leakage, slag inclusion, undercut, and insufficient weld. The remaining height is less than 2mm.
Precautions
1. Be sure to use J506 electrode for manual surfacing when making the bottom, and use low current welding. Weld in strict accordance with the welding process. 2. After each position is welded, use a level to check the deformation of the flange plane. 3. Use an air hammer to hammer the weld while welding to achieve the effect of eliminating stress.
