By Thomas Böllinghaus, Horst Herold
Although the avoidance of sizzling cracking nonetheless represents an incredible subject in sleek fabrication welding parts, the phenomena haven't but been totally understood. throughout the 20 person contributions from specialists worldwide the current nation of information approximately scorching cracking in the course of welding is outlined, and the topic is approached from 4 varied viewpoints. the 1st bankruptcy presents an outline of a number of the sizzling cracking phenomena. diverse mechanisms of solidification cracking proposed long ago many years are summarized and new perception is very given into the mechanism of ductility dip cracking. the consequences of other alloying components at the scorching cracking resistance of varied fabrics are proven within the moment bankruptcy and, as a unique metallurgical impact, the initiation of pressure corrosion cracking at sizzling cracks has been highlighted. The 3rd bankruptcy outlines how numerical analyses and different modelling strategies can be used to explain sizzling cracking phenomena and the way such effects may perhaps give a contribution to the reason of the mechanisms. a number of scorching cracking try strategies are awarded within the ultimate bankruptcy with a unique emphasis on standardization. For the engineering and normal scientists in study and improvement the ebook offers either, new perception and a finished evaluate of sizzling cracking phenomena in welds. The contributions also provide quite a few person options and valuable recommendation for overseas welding engineers to prevent sizzling cracking in perform. in addition, it represents a truly important instrument for top point metallurgical and mechanical engineering students.
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Additional info for Hot cracking phenomena in welds: with 46 tables
NbTi)C – 1 µm (Nb, Ti, Cr, Ni, Fe rich). Fig. 3,7. ) round-like M23C6 – 100 nm (Cr, Fe rich) – Associated with small TiNlike particles. ) (TiCr)(CN) – 100 nm. ) square-like M23C6 – 50 nm (Cr, Fe rich). Fig. 5. ) (NbTi)C – 50 nm - Isolated, aligned or grouped. Fig. 8. ) (NbTi)C – 50 nm – Interdendritic regions. Fig. 8. ) presumably M23C6 – or TiN-like – 10 nm. ) very likely (NbTi)C – 10 nm – Associated with grouped small (NbTi)C particles. Fig. 8. Some – Sulfur rich – Associated with medium size interNone granular (TiCr)(CN) – 1 µm.
6 cm/min Conclusions In the paper presented, the influence of the welding speed on the hot cracking resistance of TIG-welds of nickel-base alloy NiCr25FeAlY was investigated. Increased hot cracking resistance at a higher welding speed and constant welding current and voltage was observed. The material under investigation shows a tendency to form interdendritic solidification cracks dependent on the energy per unit length and on the welding speed. The experimental results of the PVR-Test allow it to select such welding speeds for TIG-welding that minimize the hot cracking sensitivity.
IX-205002) accepted for publication in Welding the World 3. Mintz B, Yue S, Jonas JJ (1991) Inter Mater Rev 36, 5: 187–217 4. Collins MG, Ramirez AJ, Lippold JC (2003) Weld J 83 (2), Part III: 39s–49s 5. Nissley NE (2002) Development of the strain-to-fracture test to study ductility dip cracking in austenitic alloys. Masters Thesis, The Ohio State University, Columbus, OH, USA, p 104 6. Nissley NE, Lippold JC (2003) Weld J 82(12): 355s–364s 7. Collins MG (2002) An investigation of ductility dip cracking in nickel-base filler materials.