magnification and under white light. The weld bead should have uniform width and should not be more than three times the nominal wall thickness. Discoloration of the weld should be kept to a minimum through proper purging with argon. All socket weld joints must have a 1/16-in. gap between the pipe end and the socket bottom (ASME B31.3, Fig. 328 COMMON FAILURE MODES IN PRESSURISED PIPELINE 1 Failure may include fracture, distortion, corrosion, erosion and other mechanisms 2 Often involves degradation and/or attack of plastic, elastomeric or other non-metallic components 3 Failure to operate may be the result of one or more of the above failure mechanisms and may lead to pipe failure
Tube and shell condenser is an important component of soybean softening equipment, and its structure is Q235B welding with 304 austenitic stainless steel pipes. During the using process of this product, it appears crack failure .In order to find the reason of crack failure, the welded joint was analyzed by SED, XRD, EDXRF and metallographic microscope in detail, and some improvement measures Difference Between Socket Weld and Butt WeldApr 05, 2019 · Socket weld is troublesome in corrosive fluid service due to crevice corrosion. And it is easy to corrode due to the discontinuity of the smooth pipe internals. Butt weld is the best in terms of strength, fatigue, and corrosion resistance, and temperatures compliance. However, it is more difficult to fit-up and weld properly, needing Investigation of pin-hole leaks in stainless steel water pipesJun 18, 2014 · Abstract. Fluids are transported, using austenitic stainless steel (SS) pipes of 3XX series to prevent corrosion products from contaminating them. Sudden failure of these pipes during operation may lead to high downtime costs and disastrous consequences. Repeated and similar leakage failure on SS pipes of 304 grade has been reported from many installations.
Jun 10, 2018 · The weld joint shows maximum hardness of 230 HV and 223 HV for 4N/SS304 and 3S/SS304 weld joint respectively which are much more than that of base SS304 alloy (175 HV) but at HAZ region the hardness is lower than that of both base alloy and weld joints (163 HV) hence the failure could be seen near weld joints due to grain modification (larger grain size shown in Figure 5c and 6c NiDl - Lawrence Berkeley National Laboratoryfusion of a pipe root pass weld such as shown in Figure 14-31 (see page 43). In some environments, corrosion takes place in the crevice which, in turn, can lead to early failure of the weld joint. Seal welding crevices Crevices between two stainless steel surfaces such as tray supports tacked to a tank, as shown in Figure 14-16 Report 7333.56-73, Rusting of Welded Joints in Stainless Report 7333.56-73 The relationship between carbon content and sensitization time is also demonstrated by Figure 4, and the influence of carbon content on degree of sensitization is shown in Figure 5. As the carbon content is increased, the time to produce a given degree of sensitization decreases. Type 304 stain- less steel has a maximum carbon content of,08 percent. Welding 304 stain- less
US3467410A US3467410DA US3467410A US 3467410 A US3467410 A US 3467410A US 3467410D A US3467410D A US 3467410DA US 3467410 A US3467410 A US 3467410A Authority US United States Prior art keywords pipe tubular sections metal corrosion welding Prior art date 1967-05-19 Legal status (The legal status is an assumption and is not a legal conclusion. Welding of Stainless Steel and Other Joining Methodsapprox.) carbon steel. This, together with its low rate of heat conductivity, At 68 ºF 12.5 72.0 accounts for the effectiveness of resistance welding methods on At 1625 ºF 125 126 Type 304. Rate of Heat Type 304 conducts heat much more slowly than carbon steel thus Austenitic Stainless Steel-Ferritic Steel Weld Joint Failureslar alloy weld failure between 2VA Cr-1 Mo steel and austenitic stainless steel steam pipe has been studied by a number of investigators (Ref. 1-15), and factors that contribute to dissimilar alloy weld failure have long been understood (Ref. 1-5). Tucker and Eberle (Ref. 4) summa rized them as:1. Cyclic thermal stresses. 2.