久久久久国产综合av天堂,亚洲国产激情一区二区三区,国内精品人妻久久久久久,精品国精品国自产在国产

Heat resistant steel is different from other materials of steel, there are many extension processes need to pay attention to, such as the welding process of heat-resistant steel castings. If the properties and technical points of heat-resistant steel are not sure, it is easy to make the whole welding quality decline, which is not what we are happy to see. So the following points need to be kept in mind.

One is the welding method. When welding heat-resistant steel castings, spot welding and symmetrical welding are adopted, and then the whole welding is carried out, so as to avoid cracking due to stress concentration. At the same time, the selection of welding rod should be learned.

The other is the treatment of welding defects. If there are defects in the welding of heat-resistant steel castings, they must be repaired according to the specified steps. Generally, the defects are cut off first and then excluded.

The third is the control of welding temperature and the treatment before welding, which is the basis to ensure the welding quality and the key to avoid all kinds of defects.