本文選題：低溫沖擊韌性　切入點：埋弧焊　出處：《江蘇科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：本文依照海洋工程用EQ56、EQ70鋼其合金成分和使用性能的要求,采用伊薩、奧林康、大西洋公司所生產(chǎn)的三種不同合金成分的埋弧焊焊絲和焊劑,進行了焊接材料熔敷金屬的焊接試驗,測試并分析了熔敷金屬的力學性能,同時采用三種焊接材料對EQ56、EQ70鋼進行了埋弧焊焊接工藝試驗。研究了在相同熱輸入條件下,不同焊接材料對焊接接頭的微觀組織、力學性能的影響,以及在相同焊接材料下,不同熱輸入對其焊接接頭的微觀組織、力學性能的影響。同時,采用窄間隙激光填絲焊的方法對EQ70鋼進行焊接,焊后對比分析了不同焊接方法對接頭不同部位的微觀組織和力學性能的影響。試驗結果表明:采用三種埋弧焊焊接材料所得到的熔敷金屬具均有良好的力學性能。EQ56鋼埋弧焊采用伊薩OK Flux 10.62焊劑匹配OK Autrod 13.40焊絲,在焊接電壓30V,焊接電流640A,層間溫度160℃的焊接工藝條件下,得到的埋弧焊焊接接頭具有優(yōu)良的性能,柱狀晶的晶粒較小且寬度較窄,內(nèi)部分布著大量細小的針狀鐵素體。接頭的抗拉強度為726MPa,-40℃條件下其焊縫中心的沖擊功為117J,熔合區(qū)的沖擊功為59J,熔合線+2mm的沖擊功為62J,熔合線+5mm的沖擊功為64J。EQ70鋼埋弧焊采用伊薩OK Flux 10.62焊劑配合OKTubrod15.27S型焊絲,在焊接電壓35V,焊接電流680A,層間溫度170℃焊接工藝條件下,焊縫均含有大量的針狀鐵素體,少量的粒狀貝氏體,極少數(shù)無碳貝氏體,得到的接頭性能最優(yōu)�？估瓘姸葹�837MPa,-40℃條件下其焊縫中心的沖擊功為91J,熔合區(qū)的沖擊功為50J,熔合線+2mm的沖擊功為62J,熔合線+5mm的沖擊功為170J。在相同的焊材下,隨著焊接熱輸入從30KJ/cm增大到40KJ/cm,EQ56、EQ70鋼埋弧焊焊接接頭都出現(xiàn)抗拉強度下降,低溫沖擊韌性下降的現(xiàn)象。HAZ區(qū)出現(xiàn)軟化問題不可避免,要嚴格限制焊接熱輸入。對于EQ70鋼,采用CARBOFIL FK 800焊絲的窄間隙激光填絲焊,單面焊雙面成形良好而且變形量很小,焊縫均勻對稱且沒有發(fā)現(xiàn)側壁未熔合、冷裂紋等缺陷,HAZ區(qū)很窄,僅為2mm左右。焊接接頭的強度很高但焊縫中心的沖擊功值很低,僅為45J,而熔合線+1mm區(qū)域的沖擊功也較低,僅為50J。從整體分布來看,EQ70鋼的埋弧焊接頭的各區(qū)域硬度值普遍低于窄間隙激光填絲焊接頭,但HAZ區(qū)的沖擊功平均值要高于窄間隙激光填絲焊接頭HAZ區(qū)沖擊功平均值。
[Abstract]:According to the marine engineering EQ56, composition and performance of EQ70 steel the alloy, by Issa, Olin Kang, three different alloy compositions Atlantic Company produced by submerged arc welding wire and flux for the welding of welding material deposited metal, mechanical properties test and analysis of the deposited metal, at the same time using three kinds of welding material for EQ56 steel, EQ70 welding process test was carried out. The submerged arc welding is studied in the same heat input conditions on Microstructure of welded joint with different welding materials, mechanical properties, and in the same welding materials under different heat input welding joints on the microstructure, mechanical properties at the same time, using the method of narrow gap laser welding with filler wire is used for welding EQ70 steel after welding, comparative analysis of different welding methods on the microstructure and mechanical properties of joints in different parts of the impact test results. Show that the three kinds of submerged arc welding materials are deposited metal with mechanical properties of.EQ56 steel have good by Issa OK Flux 10.62 OK Autrod 13.40 flux matching wire submerged arc welding, the welding voltage 30V, welding current of 640A welding interlayer temperature of 160 DEG C, the submerged arc welding has excellent the performance of welded joints, the columnar grain is smaller and narrower width, the internal distribution of acicular ferrite fine ferrite. The tensile strength is 726MPa, -40 C under the condition of the weld center the impact energy is 117J, the fusion zone of the impact energy is 59J, the fusion line +2mm impact energy is 62J, fusion line +5mm the impact energy is by Issa 64J.EQ70 Flux 10.62 OK steel submerged arc welding with flux OKTubrod15.27S welding wire, welding voltage 35V, welding current 680A, interlayer temperature of 170 DEG C welding conditions, acicular ferrite containing large amount of weld Body, a small amount of granular bainite, a handful of carbon free bainite, the joint optimal performance is obtained. The tensile strength of 837MPa, -40 C under the condition of the weld center the impact energy is 91J, the fusion zone of the impact energy is 50J, the fusion line +2mm impact energy is 62J, the fusion line +5mm impact work 170J. under the same welding, as welding heat input increased from 30KJ/cm to 40KJ/cm, EQ56, welding joint are decreasing the tensile strength of EQ70 steel submerged arc welding, low temperature impact toughness decreased the phenomenon of.HAZ zone softening is inevitable, to strictly limit the welding heat input. For the EQ70 steel, using CARBOFIL FK 800 wire narrow gap laser the wire filling welding, one side welding and good welding deformation is very small, and there was a symmetrical side wall of the lack of fusion defects such as cold crack, HAZ zone is very narrow, only about 2mm. The strength of welded joints is very high but the impact toughness of welded seam The value is very low, only 45J, and the +1mm fusion line area of impact energy is low, only 50J. from the overall distribution, the microhardness of joint submerged arc welding of EQ70 steel is lower than the value of narrow gap laser welding with filler wire, but HAZ impact energy is higher than average value of narrow gap laser wire the welding head impact area HAZ power mean value.

【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG457.11

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