Method for welding carbon steel heads

Abstract

The invention discloses a method for welding carbon steel heads, which comprises the following concrete steps of: firstly, carrying out punch forming on a mould; then, manufacturing a welding groove and determining the width of the welding groove; welding a top circular middle plate and a top circular side plate by electric slag pressure welding; splicing the top circular middle plate and the top circular side plate through welding; splicing peripheral plate pieces through welding, and carrying out air gouging and back gouging on the backs of welds under the condition of CO2 protection by using a carbon arc air gouging machine; and finally, carrying out grouped welding on the welded top circular plate and the plate pieces by using sectional skip welding. The method disclosed by the invention is implemented mainly by using an electric slag pressure welding process; and the method is high in machining efficiency, reliable in weld quality, short in welding time, high in qualified rate, low in rejection rate, beautiful in appearance and low in cost, and has a broad application prospect.

Description

technical field [0001] The invention relates to a carbon steel head welding method, which belongs to the field of manufacturing. Background technique [0002] The carbon steel head is a main pressure-bearing part of the pressure vessel, and it is also an indispensable and important part of the pressure vessel equipment in petrochemical, atomic energy, food, and pharmaceutical industries. Therefore, the quality of the carbon steel head is directly related to the quality of the pressure vessel. Long-term safe and reliable operation. [0003] At present, in the field of head welding, manual welding is widely used. However, with the development of society, the disadvantages of manual welding are becoming more and more obvious, such as many welding layers, many pores, long welding time, and high temperature inside the cylinder. High, coupled with the low one-time pass rate of the welded products through X-ray inspection, etc., resulting in a large amount of product repairs, resu...

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of head welding, manual welding is widely used. However, with the development of society, the disadvantages of manual welding are becoming more and more obvious, such as many welding layers, many pores, long welding time, and high temperature inside the cylinder. In addition, the one-time pass rate of the welded product is low in the X-ray inspection, resulting in a large amount of product repair, resulting in the quality of the welded carbon steel head not meeting the requirements for use, and the loss is large

In addition, submerged arc welding is more conventional. Usually, submerged arc automatic welding is used for welding first, and then the original weld seam is planed off after normalizing treatment, and then the weld seam is rewelded by electrode arc welding. However, this method It not only causes certain economic losses to the manufacturing plant, but also increases the labor intensity and manufacturing cycle of workers, and increases the production cost of products.

In addition, it is also possible to use argon arc welding to weld the base first, and then use manual welding to fill and cover the surface, or use manual welding to directly perform single-sided welding and double-sided molding, but the above two methods have low processing efficiency, many processes, and processing Time wasting argon, high processing costs and other issues