تعیین مقدار فلاکس اکسیدی بهینه در جوشکاری A-TIG فولاد HSLA-100

نوع مقاله : علمی و پژوهشی

نویسندگان

• نصرت اله ابدالی ¹
• علیرضا ابراهیمی ²

¹ دانشگاه صنعتی سهند

² دانشگاه صنعتی امیرکبیر- دانشکده مهندسی معدن و متالورژی

10.22067/ma.v30i2.62331

چکیده

فولاد 100-HSLA فولادی نسبتاً جدید است که به دلیل استحکام بالا و چقرمگی دما پایین، کاربرد های فراوانی در محیط های دریایی دارد. در این مطالعه اثر میزان فلاکس های اکسیدی بر هندسه جوش، ولتاژ قوس و ریزسختی مناطق مختلف جوش ورق فولادی 100-HSLA با ضخامت 4/5 میلیمتر مورد بررسی قرار گرفت. در ابتدا فلاکس های اکسیدی 2SiO و 2TiO در محدوده چگالی سطحی بین 2mg/cm 55-0 بر سطح اتصال اعمال شدند و سپس فرایند جوشکاری با الکترود تنگستن تحت حفاظت گاز خنثی به صورت گرده بر روی ورق انجام شد. جهت بررسی امکان صنعتی شدن روش جوشکاری با الکترود تنگستن تحت حفاظت گاز خنثی به همراه فلاکس فعال کننده سطحی و همچنین جهت اعمال یکنواخت پوشش، فلاکس ها با استفاده از روش اسپری بر سطح اتصال اعمال شدند. نتایج حاصل از آزمایشات نشان داد که با افزایش چگالی سطحی فلاکس­های 2SiO و 2TiO، نسبت عمق به پهنا ابتدا به سرعت افزایش و سپس به مقداری ثابت رسید که این مقادیر به ترتیب برابر 14/1 و 51/0 می باشد. شرایط بهینه چگالی سطحی مربوط به فلاکس 2SiO در محدوده2mg/cm 10-5/5 بدست آمد که بیشترین مقدار عمق نفوذ در این شرایط برابر  18/6 میلیمتر می­باشد. همچنین در هنگام افزایش چگالی سطحی فلاکس 2SiO ولتاژ جوشکاری نیز از مقدار 13 ولت در حالت بدون فلاکس به 6/16 ولت افزایش یافت که به دنبال آن حرارت ورودی افزایش و سختی حاصل مقداری کاهش یافت. در مقابل در هنگام استفاده از فلاکس 2TiO ولتاژ قوس مقداری کاهش یافت و تغییر محسوسی دیده نشد.

کلیدواژه‌ها

• جوشکاری A-TIG
• فلاکس های اکسیدی
• فولاد 100-HSLA

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عنوان مقاله [English]

Determining the Optimal Amount of Oxide Flux in A-TIG Welding of HSLA-100 Steel

نویسندگان [English]

• Nosratalah Abdali ¹
• Ali Reza Ebrahimi ²

¹ Sahand University of Technology

² Amirkabir University of Technology

چکیده [English]

The HSLA-100 steel is a newcomer steel produced by USA navy that have many applications in the marine environment structures due to its high strength and toughness. In present study the effect of SiO2 and TiO2 fluxes content on weld geometry, arc voltage and micro hardness of weld different regions of HSLA-100 steel with 5.4 mm were studied. At first oxide fluxes SiO2 and TiO2 with surface density in the range of 0-55 mg/cm2 was applied on joint, then bead on plate TIG welds are carried out. Due to determine the feasibility of industrialization and applying a uniform coating, fluxes were applied to the connection by spraying method. The results showed that depth to width ratio for SiO2 and TiO2 fluxes initially increases sharply with surface flux density increase and subsequently becoming approximately constant (1.14 and 0.51 were obtained respectively). Maximum penetration depth of 6.18 mm for A-TIG is obtained for SiO2 flux in surface flux density range 5.5 to 10 mg/cm2. Also, by increase of SiO2 surface flux density sharp arc voltage increase was observed from 13 to 16.6 V that causes heat input increase and subsequently hardness decrease. When using TiO2 flux arc voltage value fell, there was no significant change.

کلیدواژه‌ها [English]

• Oxide surface flux density
• Activated TIG welding
• HSLA-100 steel

مراجع

1. Stoudt M., Ricker R., "Characterization of the hydrogen induced cold cracking susceptibility at simulated weld zones in HSLA-100 steel", DTIC Document, (1994).

2. Shome M., Mohanty O., "Continuous cooling transformation diagrams applicable to the heat-affected zone of HSLA-80 and HSLA-100 steels", Metallurgical and Materials Transactions A, Vol. 37, pp. 2159-2169, (2006).

3. Dhua S., Mukerjee D., Sarma D., "Effect of cooling rate on the As-quenched microstructure and mechanical properties of HSLA-100 steel plates", Metallurgical and Materials Transactions A, Vol. 34, pp. 2493-2504, (2003).

4. Tseng K.H., "Development and application of oxide-based flux powder for tungsten inert gas welding of austenitic stainless steels", Powder Technology, Vol. 233, pp. 72-79, (2012).

5. Maduraimuthu V., Vasudevan M., Muthupandi V., Bhaduri A., Jayakumar T., "Effect of Activated Flux on the Microstructure, Mechanical Properties, and Residual Stresses of Modified 9Cr-1Mo Steel Weld Joints", Metallurgical and Materials Transactions B, Vol. 43, pp. 123-132, (2012).

6. Chern T.S., Tseng K.H., Tsai H.L., "Study of the characteristics of duplex stainless steel activated tungsten inert gas welds", Materials Design, Vol. 32, pp. 255-263, (2011).

7. Tseng K.H., Chuang K.J., "Application of iron-based powders in tungsten inert gas welding for 17Cr–10Ni–2Mo alloys", Powder Technology, Vol. 228, pp. 36-46, (2012).

8. Modenesi P.J., Apolinario E.R., Pereira I.M., "TIG welding with single-component fluxes", Journal of Materials Processes and Technology, Vol. 99, pp. 260-265, (2000).

9. Tseng K.H., Chen K.L., "Comparisons Between TiO2 and SiO2 Flux Assisted TIG Welding Processes", Journal of Nanoscience and Nanotechnology, Vol. 12, pp. 6359–6367, (2012).

10. Zhao Y., Shi Y., Lei Y., "The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding", Metallurgical and Materials Transactions B, Vol. 37, pp. 485-493, (2006).

11. Rückert G., Huneau B., Marya S., "Optimizing the design of silica coating for productivity gains during the TIG welding of 304L stainless steel", Materials Design, Vol. 28, pp. 2387-2393, (2007).

12. Lu S., Fujii H., Nogi K., "Marangoni convection and gas tungsten arc weld shapevariations on pure iron plates", ISIJ International, Vol. 46, pp. 276-280, (2006).

13. Leconte S., Paillard P., Chapelle P., Henrion G., Saindrenan J., "Effects of flux containing fluorides on TIG welding process", Science and Technology of Welding and Joining, Vol. 12, pp. 120-126, (2007).

14. Arunkumar V., Vasudevan M., Maduraimuthu V., Muthupandi V., "Effect of Activated Flux on the Microstructure and Mechanical Properties of 9Cr-1Mo Steel Weld Joint", Materials Manufacturing Processes, Vol. 27, pp. 1171-1177, (2012).

15. Heiple C.R., Roper J.R., Stagner R.T., Aden R.J., "Surface active element effects on the shape of GTA, laser and electron beam welds", Welding Journal, Vol. 62, pp. 72-77, (1983).

16. Tanaka M., Shimizu T., Terasaki T., Ushio M., Koshiishi F., Yang C.L., "Effects of activating flux on arc phenomena in gas tungsten arc welding", Science and Technology of Welding and Joining, Vol. 5, pp. 397-402, (2000).

17. Shanping L., Hidetoshi F., Manabu T., Kiyoshi N., "Oxide flux quantity and size effects on the penetration depth in A-TIG welding", Transactions of JWRI, Vol. 31, pp. 187-192. (2002).

18. Dong C., Zhu Y., Chai G., Zhang H., Katayama S., "Preliminary Study on the Mechanism of Arc Welding with the Activating Flux", Aerospace Manufacturing Technology, pp. 271-278, (2004).

19. Howse D., Lucas W., "Investigation into arc constriction by active fluxes for tungsten inert gas welding", Science and Technology of Welding and Joining, Vol. 5, pp. 189-193, (2000).

20. Lowke J., Tanaka M., Ushio M., "Mechanisms giving increased weld depthdue to a flux", Journal of Physics D: Applied Physics, Vol. 38, pp. 3438-3445, (2005).

21. Sandor T., Mekler C., Dobranszky J., Kaptay G., "An Improved Theoretical Model for A-TIG Welding Based on Surface Phase Transition and Reversed Marangoni Flow", Metallurgical and Materials Transactions A, Vol. 44, pp. 351-361, (2013).

22. Xu Y.L., Dong Z.B., Wei Y.H., Yang C.L., "Marangoni convection and weld shape variation in A-TIG welding process", Theoretical Applications of Fracture Mechanics, Vol. 48, pp. 178-186, (2007).