welding practices
21metallurgy — metallurgic, metallurgical, adj. metallurgically, adv. metallurgist /met l err jist/ or, esp. Brit., /meuh tal euhr jist/, n. /met l err jee/ or, esp. Brit., /meuh tal euhr jee/, n. 1. the technique or science of working or heating metals so as… …
22Track (rail transport) — Permanent way redirects here. For other uses, see Permanent way (disambiguation). Twin rail tracks in a wooded area …
23Education in the People's Republic of China — This article is about education in the People s Republic of China. See Education in Hong Kong and Education in Macau for education in Hong Kong and Macau, respectively. For education in the Republic of China (Taiwan), see Education in the… …
24work, history of the organization of — Introduction history of the methods by which society structures the activities and labour necessary to its survival. work is essential in providing the basic physical needs of food, clothing, and shelter. But work involves more than the use …
25Casting defect — A casting defect is an irregularity in the metal casting process that is undesired. Some defects can be tolerated while others can be repaired otherwise they must be eliminated. They are broken down into five main categories: gas porosity,… …
26Package testing — Military shipping container being drop tested Testing …
27Metal Building Manufacturers Association — The Metal Building Manufacturers Association (MBMA) was founded in 1956 and promotes the design and construction of metal building systems in the low rise, non residential building marketplace. A non profit trade organization, MBMA s headquarters …
28Copper — For other uses, see Copper (disambiguation) …
29Liberty ship — Liberty ships were cargo ships built in the United States during World War II. They were British in conception but adapted by the U.S., cheap and quick to build, and came to symbolize U.S. wartime industrial output. Based on vessels ordered by… …
30SR Merchant Navy class — SR Merchant Navy class[1] Official Southern Railway photograph of 21C1 Channe …
