Coiled tubing all-position automatic TIG welding process and its microstructures properties of welded joint
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摘要: 针对现场用连续管手工TIG对接焊焊接质量不稳定等问题，研究开发了全位置自动TIG焊工艺，采用该工艺对规格φ50.8 mm×4.11 mm的QT900连续管进行了管-管对接焊，并对焊接接头的宏观形貌、显微组织及力学性能进行了分析。结果表明，采用该工艺获得的焊缝成形良好，焊核区、熔合区及部分相变区在相变再结晶作用下，其焊缝组织主要以等轴状铁素体、先共析铁素体、粒状贝氏体、粒状珠光体及板条状贝氏体为主，并且与母材晶粒相比尺寸显著细化。焊后试样接头显微硬度明显增加，抗拉强度与母材相比提高约2.6%，断裂位置均位于远离焊缝的母材区。细晶强化和相变强化是其硬度和抗拉强度提高的主要因素。Abstract: In order to solve the issue of unstable welding quality for manual TIG welding of coiled tubing,a kind of all-position automatic TIG welding process was designed. By using this welding technology to conduct butt welding of QT900 coiled tubing with Ф50. 8 mm×4. 11 mm in dimensions,and the joint appearance,microstructures and mechanical properties of the welded joint were analyzed. The results showed that for the coiled tubing pipe-pipe butt joint welded by this welding technology,the welds are well formed and the microstructures of weld,fusion zone and phase transformation zone are mainly consisted of equiaxed ferrite,granular bainite,granular pearlite and lath-like bainite under the effect of phase transformation recrystallization. At the same time,the grain sizes in the above zones become thinner compared with that of the base metal. The hardness of joint obviously increases,its tensile strength is improved about 2. 6% and fracture occurs at base metal. Fine-grain strength and phase transformation strength are the main factor for the increase of hardness and tensile strength.
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Keywords:
- coiled tubing /
- automatic TIG welding /
- welding process /
- microstructure /
- mechanical performance
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