radiography of welds

. 15 … . . . . 03/12/14 1 Radiography of welds ALL CRITICAL WELDS REQUIRE ONE OR MORE METHODS OF NDT TO ASSURE QUALITY , ENSURE SAFETY AND PROVIDE OVERALL SYSTEM RELIABILITY. RADIOGRAPHY IS ONE OF THE ESSENTIAL. ARTIFACTS 2. WRONG SELECTION OF SOURCE/ENERGY 3. WRONG SELECTION OF TECHNIQUE 4. SHORT SFD AND LONG OFD 5. WRONG SELECTION OF FILM, SCREEN AND FILM SCREEN COMBINATION 6. PREVENTION O...

Ngày tải lên: 12/03/2014, 18:01

. REQUIREMENTS 3.12.1 Testing of welds in flat surfaces and longitudinal welds in curved surfaces For the testing of welds in flat surfaces and longitudual welds in curved surfaces, the beam of radiation should. projected beam passes through the centre of the pipe, in the plane of the weld. To avoid superimposition of the images of the welds, the source of radiation should be offset from the plan...

Ngày tải lên: 12/03/2014, 18:02

Ngày tải lên: 07/08/2012, 11:48

. of the method was that the dimensions of the particles were punched on paper tape, so automatic data analysis was possible”. 4.1.2 Growth of Single Hyphal Elements Measurement of the growth of. development of mycelia. It allows careful observation , not only of the hyphae such as hyphal growth rate, rate of branching etc., but also – to some extent – of the development of micro- structures. 4.1....

Ngày tải lên: 08/08/2012, 09:49

. canker of stone fruit trees and holcus spot of maize, and is also a broad-spectrum antibiotic against procaryotes and eucaryotes including Geotrichum candidum [81]. Proof of the role of antibiotics as. all of the primary metabolic pathways and most of the relevant regulatory mechanisms; many of the enzymes were purified, and the genes encoding them isolated,cloned,and sequenced.The frontier of....

Ngày tải lên: 08/08/2012, 09:52