Hot cracking phenomena in welds II by Thomas Böllinghaus; et al

By Thomas Böllinghaus; et al

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Nevertheless, this one remains almost unchanged when increasing the amount of 4047. 1 0 490 510 530 550 570 590 610 630 650 Fig. 6. Solidification paths of AA2098 alloy plus AA4047 filler 30000 HCS (Integral A) 25000 20000 15000 10000 5000 0 2098 2098 + 4047 15% 2098 + 4047 25% 2098 + 4047 33% Filler content Fig. 7. e. in a given thermal gradient and with a given solidification speed. The hot cracking susceptibility, HCS, is therefore defined as the inverse of the maximum strain rate sustainable by the mushy alloy.

Weld Solidification Cracking TL 41 TS BTR B Strain A εmin dε/dT C (a) (c) Temperature (b) (d) Fig. 1. Ductility curve comparison showing (a) general schematic, (b) aluminum alloys [4], (c) plain carbon steel alloys [5], and (d) austenitic stainless steel alloys [5] Developers of the ductility curve concept believed that strain accumulation is an important factor in determining whether cracks will form. It was argued that strain accumulates from the beginning of solidification and, if accumulated in sufficiently high amounts during solidification (as represented by line A in Fig.

E. removed from the torch path and possible exposure to heat). This allows measurement of strain as the welding torch passes between the affixed pins. e. plane strain) to provide any useful information. An example of one such measurement for an autogenous Al 6060 weld is given in Fig. 5 mm gage) has been placed at the mid-span of a 100 mm long joint and the torch passes over the extensometer at approximately 15 s. 5%/s in mushy zone). (a) (b) Fig. 5. 5 mm gage) made on 4 mm aluminum 6060-T6 plate, (b) first derivative of strain-time curve in (a) showing transverse strain rate Extensometer measurements are limited to a fixed location and gage length.

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