厚板Q690E鋼雙絲窄間隙SAW工藝研究
本文選題:低合金高強(qiáng)鋼 + 窄間隙埋弧焊 ; 參考:《昆明理工大學(xué)》2017年碩士論文
【摘要】:隨著海洋工程裝備的發(fā)展,厚板的應(yīng)用越來(lái)越廣泛,對(duì)焊接質(zhì)量和效率提出了更高的要求。窄間隙焊接因具有較高熔敷率,接頭力學(xué)性能優(yōu)良,較小熱輸入量,成為海洋工程裝備厚板焊接的發(fā)展趨勢(shì)。而雙絲埋弧焊作為一種高效焊接方法,通過(guò)調(diào)節(jié)前后絲電流值,控制焊接線能量的輸入,能夠滿足在不同工況下的使用要求。低合金高強(qiáng)鋼廣泛應(yīng)用于橋梁建筑、工程機(jī)械、船舶制造、海洋結(jié)構(gòu)等領(lǐng)域。針對(duì)海洋平臺(tái)用鋼Q690E高強(qiáng)鋼焊接條件差,冷裂紋傾向大等問(wèn)題,本文提出了雙絲窄間隙埋弧焊工藝方法,并對(duì)Q690E高強(qiáng)鋼的窄間隙埋弧焊工藝進(jìn)行了研究。設(shè)備是保證焊接過(guò)程穩(wěn)定的關(guān)鍵因素。實(shí)驗(yàn)選擇HSS-350W型焊接機(jī)頭、ARISTORAC-DC 1000焊接電源、PEK過(guò)程控制器、重型立柱-橫梁操作機(jī)等搭建了窄間隙埋弧焊焊接平臺(tái),并從功能、結(jié)構(gòu)等方面優(yōu)化埋弧焊矩。在此基礎(chǔ)上采用控制變量法進(jìn)行了雙絲窄間隙焊接工藝研究,探索了焊接電流、焊接速度、絲壁間距對(duì)雙絲窄間隙埋弧焊焊縫成形影響規(guī)律,只有在合理的工藝參數(shù)范圍內(nèi)才能獲得滿足要求的焊縫成形。在焊接方法確定的情況下,焊接材料對(duì)焊縫化學(xué)成分、組織結(jié)構(gòu)等具有重要影響。結(jié)合以上工藝試驗(yàn),選用兩種類(lèi)型焊絲,對(duì)60mm深坡口 Q690E高強(qiáng)鋼進(jìn)行雙絲窄間隙埋弧焊焊材實(shí)驗(yàn),得到了成形良好無(wú)宏觀缺陷的多層雙絲窄間隙焊縫,優(yōu)選出性能優(yōu)異且滿足使用要求的焊材。通過(guò)焊接接頭的力學(xué)性能試驗(yàn)、微觀組織分析,研究了不同焊接熱輸入對(duì)焊接接頭組織和性能的影響。
[Abstract]:With the development of marine engineering equipment, the application of thick plate is more and more extensive, which requires higher welding quality and efficiency. Narrow gap welding has become the development trend of thick plate welding for marine engineering equipment due to its high deposition rate, excellent mechanical properties and small heat input. As a high efficiency welding method, double wire submerged arc welding can meet the requirements of different working conditions by adjusting the current value of wire before and after, and controlling the input of welding line energy. Low-alloy high-strength steel is widely used in bridge construction, construction machinery, shipbuilding, marine structure and other fields. Aiming at the problems of poor welding condition and large cold crack tendency of Q690E high strength steel for offshore platform, this paper puts forward the process method of double wire narrow gap submerged arc welding, and studies the narrow gap submerged arc welding process of Q690E high strength steel. Equipment is the key factor to ensure the stability of welding process. A narrow gap submerged arc welding platform was built by using HSS-350W welding machine head and ARISTORAC-DC 1000 welding power source and heavy column beam operator, etc. The moment of submerged arc welding was optimized in terms of function and structure. On this basis, the control variable method is used to study the welding process of double wire narrow gap welding, and the influence of welding current, welding speed and wire wall spacing on the weld formation of double wire narrow gap submerged arc welding is explored. Only within a reasonable range of process parameters can the weld forming meet the requirements. The welding material has an important effect on the chemical composition and microstructure of the weld under the condition of the determination of welding method. Combined with the above process tests, two types of welding wires were selected to conduct double-wire narrow gap submerged arc welding on 60mm deep groove Q690E high strength steel, and the multi-layer double-wire narrow gap weld without macroscopic defects was obtained. Excellent selection of excellent performance and meet the requirements of the use of welding materials. The effects of different welding heat input on the microstructure and properties of welded joints were studied by mechanical property test and microstructure analysis.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TG457.11;TE95
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