By different ways of weld experimentation,in terms of macroscopical examination,metallography analysis,tension strength test etc,a study of weld procedure of aluminizing carbon steel tube-to-tubesheet have been made,and relevant parameter and a good way to weld those piece of tube-to-tubesheet were obtained.

The influence on aluminizing carbon steel of temperature,partial pressure of CO2,mineralization and pH value was studied through zero-G test.

The results showed that the susceptibility to H2S corrosion cracking of the weld seam is higher than that of the relevant matrix; the SCC susceptibility of Aluminized Mild Steel is lower than that of steels of 20# and 16MnR; The application of aluminized mild steel to heat exchanger was suggested.