Abstract
In This research article deals with the study of cold cracking susceptibility of High Strength Low Alloy Steel (HSLA) 950A using Gas Metal Arc Welding process (GMAW). The cold cracking is a general problem while welding HSLA steels. It thus becomes mandatory to have a novel method of welding to minimize the effects of cold cracking. The cold cracking tendency of the material is determined using the Y groove Tekken test and the test is carried out with DIN EN ISO 17642–2 standard. The welding of the base metal has been carried out using the low hydrogen electrode ER 70SD2. The test procedure is followed under self-restraint condition for determining cold cracking susceptibility of weld metal. Micro structural constituent of the weld metal plays an important role in determining the cold crack susceptibility of the weld metal. Hence an attempt has been made to impart the microstructure having high resistance to cold cracking. It has been observed that Acicular ferrite microstructure in the weld metal increases the cold cracking resistance of the welded joint. In the present study, the effect of preheating temperature on cold crack susceptibility analyzed by varying the preheating temperature 100ºC, 150ºC and acicular ferrite microstructure observed in the microstructure analysis of the welded specimen. The effect of microstructure on cold cracking has also been established. But due to very limited range of temperature, the effect of preheating temperature on cold crack susceptibility was inconclusive. But the formation of acicular ferrite microstructure will have greater influence on cold crack susceptibility. In future, effects of Nickel, Manganese and other alloying elements of the filler material in increasing cold cracking resistance can also be studied for far reaching prospects of the research.
Highlights
High Strength Low Alloy Steel (HSLA) steels are used widely for construction of large scale welded structures
The performed experimental investigations on weldments of HSLA steel SAE grade 950A by Tekken test clearly shows that within the covered range of welding conditions cold cracking may occur in the weld metal
It is observed that the acicular ferrite formed in the weld metal has greater cold cracking resistance[13,14]
Summary
HSLA steels are used widely for construction of large scale welded structures. HSLA steel is a type of alloy steel that provides better mechanical properties[1]. The cold cracking test procedures and diverse investigation methods may serve to determine hot crack formation during welding [4]. The objective of study is to determine the effect of preheating temperatures on cold crack susceptibility of HSLA steel. Y-groove Tekken test is used to study the cold cracking susceptibility of the welded metal.
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