Learning technical English used in the metalworking sector can be challenging, but there are several ways to improve your understanding and proficiency. Some suggestions include:

1. Take a course: You can take a course specifically designed to teach technical English used in the metalworking sector. This can be done through vocational schools, community colleges, or online programs.
2. Read technical literature: Read technical literature, such as metalworking journals, books, and articles. This will expose you to the technical vocabulary and terminology used in the industry.
3. Watch videos: Watch videos of metalworking processes and procedures. This will give you a visual understanding of the concepts and techniques being discussed.
4. Practice: Practice using the technical English you have learned by participating in online forums or discussion groups related to metalworking.
5. Get a mentor: Find a mentor who works in the metalworking sector and can provide you with guidance and support as you learn the technical language.
6. Find a language exchange partner: Find someone who is a native English speaker and willing to practice with you.
7. Use flashcards: Create flashcards with technical terms and their meanings to help you memorize them.
8. Try to watch tutorials, webinars and attend virtual conferences related to metalworking, as they can provide a wealth of information and can help to improve your understanding of the industry.

It’s important to note that learning a new language takes time, effort and patience, but with consistent practice, you can improve your understanding and proficiency in technical English used in the metalworking sector.