Amtech Systems Inc., a global supplier of production and automation systems and related supplies for the manufacture of solar cells and semiconductors, completed its acquisition of BTU International (BTU), a global supplier of thermal-processing equipment and processes to the electronics and alternative-energy markets. According to Tempe, Ariz.-based Amtech, BTU provides it with complementary thermal-processing technologies in the semiconductor and solar sectors. North Billerica, Mass.-based BTU also strengthens Amtech’s footprint in China and other geographic markets with attractive growth trends.