A few days ago, the American Manufacturing Technology Association (AMT) and the American Machine Tool Distributors Association (AMTDA) announced the latest statistics on the consumption of metalworking machine tools in the United States. In May 2011, the number of orders for metalworking machine tools in the United States was 2,162 units, an increase of 3.94% from 2,080 units in the previous month and an increase of 77.36% from 1,209 units in May 2010. In May 2011, the U.S. metal processing machine tool consumption was 388 million U.S. dollars, which was 2.6% lower than the 398 million U.S. dollars of the previous month, but a substantial increase of 121.3% compared with the 175 million U.S. dollars in May 2010. From January to May 2011, the cumulative consumption of metal processing machines in the United States was US$1.985 billion, a substantial increase of 108% from US$954 million in the same period of 2010.
From the product category, in May 2011, the orders for metal cutting machine tools and metal forming machine tools in the United States were 2016 and 1146, respectively, both of which increased from the previous month. In May 2011, the consumption of metal cutting machine tools was US$352 million, a decrease of 2.9% from US$363 million in the previous month but an increase of 114.1% from US$165 million in May 2010; the consumption of metal forming and manufacturing machine tools It was US$35.75 million, an increase of 0.6% from US$35.54 million in the previous month and a substantial increase of 231.8% from US$ 10.78 million in May 2010. From January to May 2011, the consumption of metal cutting machine tools in the United States was 1.824 billion U.S. dollars, an increase of 108.3% year-on-year; the consumption of metal forming and manufacturing machine tools was 161 million U.S. dollars, an increase of 104.1% year-on-year. AMTDA chairman Peter Borden pointed out: "The order data for May shows that the member companies of the Association continue to maintain a strong momentum of production. The level of 2,000 units / Taiwan marks the end of the second quarter, the overall market demand has performed well."
Mapp Gas
MAPP is colorless in both liquid and gas form. The gas has a pronounced acetylene-like or fishy odor at concentrations above 100 ppm, due to the addition of substituted amines as a polymerization inhibitor. Low molecular weight alkynes have strong odors. MAPP gas is toxic if inhaled at high concentrations. Mapp gas is a mixture of various hydrocarbons, principally, methylacetylene , propadiene and Propane(MAPP). It produces a relatively hot flame (2,976°C) with a high heat release in the primary lame (inner cone) (15,445kJ/m 3 ), less than for acetylene (18,890kJm 3 ) but much higher than for propane (10,433kJm 3 ). The secondary flame (outer cone) also gives off a high heat release, similar to propane and natural gas. The combination of a lower flame temperature, more distributed heat source and larger gas flows compared with acetylene results in a substantially slower pierce time.
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