Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Temperature distribution

Numerical Analysis of the Effect of Weld – Joints Preheating on Temperature Distributions In GMAW

Abbas Sh. Alwan; Jalal M. Jalil; Muna K. Abbass

Engineering and Technology Journal, 2014, Volume 32, Issue 2, Pages 325-338

In this research , medium carbon steel type (AISI 1045 ) sheets with 8 mm thickness were welded by Gas Metal Arc Welding Process (GMAW), this study included the application of numerical analyses by using control volume method (CVM) to obtain the effect of preheating process with different temperatures (75 ˚C , 125 ˚C and 225 ˚C ) on temperature distribution of the welded joint in addition to determination of cooling rates which were achieved for 3-D heat transfer in the weldment. Results showed the analyses contributed effectively to predict the temperatures distribution for the welded joint and get mathematical models for the cooling rates at welding variables ( welding speed was equal 2.5 mm / sec , and welding current was equal 180 Amp ) with different preheating temperatures.

Study of Thermal Characteristics of a Composite Specimen Experimentally and by Using Finite Element Method

Jawad Kadhim Uleiwi; Sura Salim

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 429-441

This research deals with the study of the effect of fibers volume
fraction and fibers orientation on the thermal conductivity and wall surface
temperatures for composite specimen in form of Lee’s disk by using
experimental work and finite element technique. The results show that
the thermal conductivity increases with increasing fiber volume fraction of
the composite specimen, and in the longitudinal direction is larger than in
the lateral fiber direction.The experimental results indicated that the largest
value of the thermal conductivity for the composite specimen was (0.611
W/m.°c) at (Vf = 40 %) in the longitudinal direction, while the lowest value
was (0.195 W/m.°c) at (Vf = 10 %) in the lateral direction. Also the results
show that the maximum difference for the thermal conductivity between the
experimental work and finite element method was ( 7 % ) at ( Vf = 10 % )
in the lateral direction while the minimum value was ( 3.5 % ) at ( Vf = 40
% ) in the longitudinal direction.