Thermal cutting

The stress values given for tliis material are not applicable when either welding or thermal cutting is employed. 

Thermal Cutting the parting or shaping of materials by the application of heat with or without a stream of cutting oxygen. 

Internal and external surfaces to be thermally cut or welded shall be cleaned to remove paint, oil, rust, scale, grease, slag, oxides, and other deleterious material that would be detrimental to the base metal. 

Thermal cutting or fuel cutting for end preparation is acceptable if the surface is reasonably smooth, true, and free of slag. The thermal cutting shall be followed by mechanical preparation to achieve the final weld joint end detail. Discoloration (oxidation) remaining from the cutting method shall be removed. 

It has recently been noted that if copper-induced MEE does occur, it is a very rare event. Despite extensive use of copper in many industries, only a handful of MEE cases are reported in the literature. Further limitations of these reports include possible contamination of the fume by other substances more likely to have caused MFF, atypical symptoms and complaints, and lack of consistency among types of work associated with symptoms. One reason that MFF may have rarely been described after copper exposure is that aerosolized copper particulates formed during welding, thermal cutting, and other hot work are mostly greater than respirable or submicron size. Studies of air in a brass foundry found that only 5% of the total copper exposure was respirable (aerosol less than or equal to 1 )im), whereas 40% of the zinc oxide exposures were to an aerosolized particulate of respirable size. ... 

Heat-affected zone (HAZ) is the volume of parent metal in which the mechanical properties and/or the microstructure have been changed by the heat of welding or thermal cutting. For most welds in carbon and low-alloy steels, the HAZ is a band, usually about 1/8 in. (3 mm) wide, adjacent to the fusion line of the weld. In austenitic stainless steels, a narrow, secondary HAZ may be generated some distance from the fusion line as illustrated in Figure 21.4. 

PHYSICAL PROPERTIES finely divided, white particulates dispersed in air odorless exposure may occur when magnesium is burned, thermally cut, or welded upon very slightly soluble in pure water solubility increased by carbon dioxide soluble in dilute acids and ammonium salt solutions not soluble in alcohol highly reflective in visible region and near ultra-violet region MP (2800°C, 5072 F) BP (3600°C, 6512°F) DN (3.65-3.75 gW solid) SG (3.58 at 25°C) CP (37.2 J/K-mol crystal at 25°C) VD (no information found) VP (0 mmHg approximately). 

Physical Description Finely divided white particulate dispersed in air. [Note Exposure may occur when magnesium is burned, thermally cut, or welded upon.] ... 

That part of the parent metal that is metallurgically affected by the heat of welding or thermal cutting, but not melted. 

Errors associated with locomaintenance (7 errors), e.g., fitting incorrect thermal cut-offs... 

By scanning the beam or moving an XY table, the electron beam can cut metal sheets. The small spot size produces a narrower kerf and a smoother cut siuface than other thermal cutting methods. 

United States Department of Health and Human Services, National Institute for Occupational Safety and Health. Criteria for a Recommended Standard Welding, Brazing and Thermal Cutting, Publication 88-110. Washington, D.C. U.S. Government Printing Office, 1988. 

For the dismantling of the containment shell, appropriate lifting and conveying devices are to be installed. In order to disassemble the containment a thermal cutting method is advantageous for cost reasons. 

The touch input is connected to a power switch ( controller ) which controls the power setting of the heating elements. Thermal cut-outs on each heating element make sure that the glass ceramic temperature is kept in the intended limits. Temperature sensors can be installed to provide automatic cooking functions. A pan detection can control multi-circuit heating elements according to the size of the pan used. 

Criteria for a Recommended Standard—Welding, Brazing, and Thermal Cutting. 

Platcow, P.A., and G.S. Lyndon. 1998. Welding and thermal cutting. InEncydopaedia of Occupational Health and Safety. Geneva ILO Publications. 

AIWJ is today s state of the art and is worldwide applied in industrial manufacturing with pressures up to 6000 bar. With the AWIJ, all hard materials such as metals, ceramic- and fiber-reinforced composite materials, glass, or stone can be cut. In this field, the abrasive waterjet competes with mechanical sawing, wire sawing, punching, EDM, and laser and thermal cutting techniques. 

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