Numerical Analysis of the Effect of Weld-Joints Preheating on Temperature Distributions In GMAW ‫ﻟﺘﺄﺛﯿﺮ‬ ‫اﻟﻌﺪدﯾﺔ‬ ‫اﻟﺘﺤﻠﯿﻼت‬ ‫اﻟﺮﺑﻂ‬ ‫ﻟﻤﻨﻄﻘﺔ‬ ‫اﻷوﻟﻲ‬ ‫اﻟﺘﺴﺨﯿﻦ‬ ‫ﺑﻌﻤﻠﯿﺔ‬ ‫اﻟﺤﺮاري‬ ‫اﻟﺘﻮزﯾﻊ‬ ‫ﻋﻠﻰ‬ ‫اﻟﻐﺎزي‬ ‫اﻟﻤﻌﺪﻧﻲ‬ ‫اﻟﻜﮭﺮﺑﺎﺋﻲ‬ ‫اﻟﻘﻮس‬ ‫ﻟﺤﺎم‬

Abbas Sh, Alwan, Jalal Jalil, Muna Abbass
2014 Tech. Journal   unpublished
ABSTRUCT 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˚C75˚C , 125˚C125˚C and 225˚C225˚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
more » ... nsfer 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. ‫اﻟﺨﻼﺻــ‬ ‫ﮫ‬ : ‫ھﺬ‬ ‫ﻓﻲ‬ ‫ا‬ ‫اﻟﻔﻮﻻذ‬ ‫ﻣﻦ‬ ‫ﺻﻔﺎﺋﺢ‬ ‫ﻟﺤﺎم‬ ‫ﺗﻢ‬ ‫اﻟﺒﺤﺚ‬ ‫ﻂ‬ ‫ﻣﺘﻮﺳ‬ ‫ﻮع‬ ‫ﻧ‬ ‫ﻮن‬ ‫اﻟﻜﺮﺑ‬) (AISI1045 ‫ﺎم‬ ‫ﻟﺤ‬ ‫ﺔ‬ ‫ﺑﻄﺮﯾﻘ‬ ‫ﺪﻧﻲ‬ ‫اﻟﻤﻌ‬ ‫اﻟﻜﮭﺮﺑﺎﺋﻲ‬ ‫اﻟﻘﻮس‬ ‫ﺎزي‬ ‫اﻟﻐ‬) GMAW (‫ﻤﻚ‬ ‫ﺳ‬ ‫ذات‬ ‫ﻔﯿﺤﺔ‬ ‫ﻟﺼ‬ 8 ‫ﻢ‬ ‫ﻣﻠ‬. ‫ﺔ‬ ‫اﻟﺪراﺳ‬ ‫ﺬه‬ ‫ھ‬ ‫ﻤﻨﺖ‬ ‫ﺗﻀ‬ ‫ﺪود‬ ‫اﻟﻤﺤ‬ ‫ﻮم‬ ‫اﻟﺤﺠ‬ ‫ﺔ‬ ‫طﺮﯾﻘ‬ ‫ﺘﺨﺪام‬ ‫ﺑﺎﺳ‬ ‫ﺔ‬ ‫اﻟﻌﺪدﯾ‬ ‫ﯿﻼت‬ ‫اﻟﺘﺤﻠ‬ ‫ﻖ‬ ‫ﺗﻄﺒﯿ‬) CVM (‫اﻟ‬ ‫ﺔ‬ ‫ﻋﻤﻠﯿ‬ ‫ﺎﺛﯿﺮ‬ ‫ﺗ‬ ‫ﻰ‬ ‫ﻋﻠ‬ ‫ﺨﯿﻦ‬ ‫ﺘﺴ‬ ‫ھﻲ‬ ‫ﺣﺮارﯾﺔ‬ ‫درﺟﺎت‬ ‫ﺑﺎﺧﺘﻼف‬ ‫اﻻوﻟﻲ‬) 75 ‫م‬ º , 125 ‫م‬ º , 225 ‫م‬ º (‫اﻟﺮﺑﻂ‬ ‫ﻟﻤﻨﻄﻘﺔ‬ ‫اﻟﺤﺮاري‬ ‫اﻟﺘﻮزﯾﻊ‬ ‫ﻋﻠﻰ‬ , ‫اﻟﻤﻠﺤﻮﻣﺔ‬ ‫ﻓﻲ‬ ‫اﻻﺑﻌﺎد‬ ‫اﻟﺜﻼﺛﻲ‬ ‫اﻟﺤﺮاره‬ ‫ﻻﻧﺘﻘﺎل‬ ‫اﻟﺘﺒﺮﯾﺪ‬ ‫ﻣﻌﺪﻻت‬ ‫ﺗﺤﺪﯾﺪ‬ ‫ﻋﻦ‬ ‫ﻓﻀﻼ‬. ‫ﺔ‬ ‫اﻟﻌﺪدﯾ‬ ‫ﯿﻼت‬ ‫اﻟﺘﺤﻠ‬ ‫ﺎﺋﺞ‬ ‫ﻧﺘ‬ ‫ﻦ‬ ‫ﻋ‬ ‫ﺆ‬ ‫اﻟﺘﻨﺒ‬ ‫ﻓﻲ‬ ‫ﻓﻌﺎل‬ ‫ﺑﺸﻜﻞ‬ ‫ﺳﺎھﻤﺖ‬ ‫اﻧﮭﺎ‬ ‫ﺗﯿﺒﻦ‬ ‫ﻟﻤﻨﻄﻘ‬ ‫ﺮاري‬ ‫اﻟﺤ‬ ‫ﻊ‬ ‫اﻟﺘﻮزﯾ‬ ‫ﺎذج‬ ‫ﻧﻤ‬ ‫ﻰ‬ ‫ﻋﻠ‬ ‫ﻮل‬ ‫واﻟﺤﺼ‬ ‫ﺎم‬ ‫اﻟﻠﺤ‬ ‫ﺔ‬ ‫ﻲ‬ ‫ھ‬ ‫ﺎم‬ ‫اﻟﻠﺤ‬ ‫ﺮوف‬ ‫ظ‬ ‫ﺮات‬ ‫ﻣﺘﻐﯿ‬ ‫ﺪ‬ ‫ﻋﻨ‬ ‫ﺪ‬ ‫اﻟﺘﺒﺮﯾ‬ ‫ﻟﻤﻌﺪﻻت‬ ‫رﯾﺎﺿﯿﺔ‬) ‫ﺎم‬ ‫ﻟﺤ‬ ‫ﺮﻋﺔ‬ ‫ﺳ‬ 2.5 ‫ﻢ‬ ‫ﻣﻠ‬ / ‫ﺎم‬ ‫ﻟﺤ‬ ‫ﺎر‬ ‫وﺗﯿ‬ ‫ﺔ‬ ‫ﺛﺎﻧﯿ‬ 180 ‫اﻻوﻟﻲ‬ ‫ﻟﻠﺘﺴﺨﯿﻦ‬ ‫اﻟﺤﺮارة‬ ‫درﺟﺎت‬ ‫ﻣﺨﺘﻠﻒ‬ ‫وﻋﻨﺪ‬ ‫أﻣﺒﯿﺮ‬ .(INTRODUCTION as Metal Arc welding (GMAW) process uses the filler metal as a consumable electrode through the center of the weldement. In this case, when the electrode becomes close to the workpiece, an arc is struck between the filler metal and the workpiece, and the filler metal melts and joins the two plates by filling metal droplet simultaneously in V-groove of plates. In the present work, a three