Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : arc welding

One Parameter Composite Semigroups of Linear Bounded Operators in Strong Operator Topology of Schatten Class Cp

Samir Kasim Hassan; Al-Taie M; Al-Malki Anam; Al-Attar Abeer; Mustafa Khaleel Ismael; Fatema Ahmed Sadeq; Radhi A .Zboon; Jehad R.Kider; Samir K .Hassan; Hussain J. M. Alalkawi; Raad H. Majid; Rawaa A. Alomairy; Luma Abdul Ghani Zghair; Hadia Kadhim J.Al-Ogili; Assifa M. Mohamad; Abbas Sheyaa Alwan; Haider L. Aneed; Assim H Yousif; Salema Sultan Salman; Abbas Hussien Miry; Abduladhem A.Ali; Mohammed Zeki Al-Faiz; Sabah N. mahmood; Khansaa Dawood Selman; Shaymaa Tareq Kadhim

Engineering and Technology Journal, 2011, Volume 29, Issue 8, Pages 1463-1470

For semigroups of linear bounded operators on Hilbert spaces, the problem of
being in Cp , 0 Keywords

Effect of Normalizing Process on Mechanical Properties of Submerged-arc Weldment

Abbas Sheyaa Alwan

Engineering and Technology Journal, 2011, Volume 29, Issue 8, Pages 1554-1562

Submerged arc welding is carried out and efficient metal- joining process widely
used in great importance in many industrial applications, structures of ships, storage
tanks and agriculture equipments. Low alloy steel used under welding conditions
which are, (560 Amp) welding current, (42cm/min) welding speed, (3.25mm) wire
diameter, direct current straight polarity (DCSP) with the joint geometry of single -Vbutt
joint and weld one pass are used for plate of thickness 16mm. After welding, the
components have be submitted to a normalization heat treatment in order to recover
the original mechanical properties of the welds. In this work two different filer metals
both in the as welded condition and after normalizing heat treatment have been studied.
Optical microscopy was used to observe the weld microstructure. Tensile and Charpy
V toughness testing and microhardness measurements were used to evaluate the
mechanical properties of joint. Results show that normalizing reduces the original
columnar structure in the as welded condition to an equiaxial structure. It was observed
a high decrease in the tensile properties specially the yield strength after normalizing.
In respect of toughness, the normalizing heat treatment was observed to increase the
Charpy V energy.