Before the spread of the Internet, everyone dealt with letters and stamps. One of the pastimes of that time was to separate the stamp from the envelope and keep it. I also had a stamp album when I was a teenager. Therefore, it is not strange that when I started my career as a welding engineer, I looked for the connection between postage stamps and welding.
The file below is the result of that effort.
PS: Unfortunately, I have not written down the references that I used.
کانی سیلیکات کلسیم و کربنات کلسیم آبدار در سال 1957میلادی کشف و به افتخار دانشمند ایرانی، ابوریحان بیرونی به نام …
Last week, I upload here a file called ASTM Terminology Standards. After that, Mohammad Fouladi suggested to prepare a file …
Duplex stainless steels are a family of stainless steels that called duplex (or austenitic-ferritic) grades because their metallurgical structure consists …
