Effect of Temperature Variation of Static Thermal Tensioning on Angular Distortion and Sensitization behavior of GMAW Welded SUS 304 Stainless Steel Plate

Due to its rust resistance properties, the use of stainless steels, especially SUS304 for industrial equipment is increasing. The manufacturing process that is often used is GMAW welding. One of the disadvantages of SUS304 is the occurrence of distortion and sensitization when welded. In this study, the effect of temperature variations of Static Thermal Tensioning on angle distortion and microstructure behavior due to GMAW welding of SUS 304 T-joint plates was studied. Heating by electric heater is given to both parts of the base metal plate SUS 304 5mm thick with temperature variations of 200 oC, 250 oC and 300 oC. Cooling water with a temperature of 24 oC is provided on the back side of the welded track. Welding using filler ER 304 with a diameter of 0.8 mm with welding parameters such as welding current, voltage, gas flow and travel speed controlled at 75 A, 22 V, 10 l/min and 8 mm/s, respectively. Angular distortion of welding results for each treatment temperature variation was measured using a bevel protractor, and perform metallographic test to knowing the microstructural behavior. The results of the measurement of the average angular distortion of three repetitions show that at a temperature of 250 C static thermal tensioning produces the smallest angular distortion of 3ᵒ70', compared to other temperature variations which produce angular distortion 4o45’ at 200 oC and 3o86' at temperature 300 oC. The findings of the largest Cr (carbide) deposits due to sensitization were found at a temperature of 300 oC at 16,49% and the lowest at a temperature of 200 oC at 7,05%

Analisis Perbandingan Metode Pengelasan untuk Mengendalikan Distorsi dan Tegangan Sisa – Review

Distortion and residual stress can have undesirable effects on weldments, such as repair work and higher fabrication costs. This study compares welding methods in reducing distortion and residual stress to obtain advantages and disadvantages. The study focused on reviewing several journals from previous research that focused on comparing welding methods. The results show that the Dynamically Controlled Low-Stress No Distortion (DC-LSND) welding method has the most significant ability to reduce distortion and residual stress and does not reduce the weld joint's fatigue resistance. The welding methods of static thermal tensioning (STT) and Transient thermal tensioning (TTT) can significantly decrease distortion and residual stress. They can improve the fatigue resistance of welded joints. The Double Side Arc Welding (DSAW) method effectively reduces distortion. However, the application in large construction welds is difficult to achieve. Distorsi dan tegangan sisa memberikan pengaruh yang tidak diinginkan pada pengelasan seperti perlunya pekerjaan perbaikan dan meningkatnya biaya fabrikasi. Tujuan penelitian adalah membandingkan metode pengelasan untuk mereduksi distorsi dan tegangan sisa untuk memperoleh kelebihan dan kekurangan. Metode penelitian dilakukan dengan review beberapa literatur jurnal hasil penelitian sebelumnya yang difokuskan pada perbandingan metode pengelasan dalam mereduksi distorsi dan tegangan sisa. Hasil penelitian menunjukkan metode las dynamically controlled low stress no distortion (DC-LSND) memiliki kemampuan mereduksi distorsi dan tegangan sisa paling efektif dan tidak menurunkan ketahanan fatik sambungan las, metode las static thermal tensioning (STT) dan transient thermal tensioning (TTT) memiliki kemampuan mereduksi distorsi dan tegangan sisa dengan signifikan serta mampu meningkatkan ketahanan fatik sambungan las, metode las doublé side arc welding (DSAW) efektif mereduksi distorsi namun sulit diterapkan pada pengelasan konstruksi yang besar.

PERPATAHAN FATIK MATERIAL ALUMINIUM 2024-T3 DENGAN PENGELASAN FSW

Resilient, machine processed, shapped aluminium using pulling power for pure aluminium with 4-5kgf/mm2. Aluminium fusion with series 2024-T3 is a metal fusion whose low weldability so it is very difficult to be conducted the welding process because it tends to occur hot cracking or being porous, and precipitation hardening when conducting welding process due to segregation of copper (Cu) fusion subtance. One of welding method to obtain the good aluminium welding result is by using FSW (friction stir welding). The purpose of this research is to find out the shape and type of fracture on aluminium fusion with FSW welding by dealing TTT. The fracture is created from fatik substance test. The reserach method was conducted by welding of plate aluminium fusion 2024-T3 using FSW technique by dealing transient thermal tensioning (TTT). Transient thermal was conducted by resigning heater line with weld tool/pin. The speed of determined FSW welding was 11 mm/minutes and 1200 rpm. The conducted test was fatigue test and factografi test with SEM. The result of the reserach shows that the number of fatik test cycle is 765.250 with sigmoidal curve visually. Then, the result of fractography using SEM shows that the occured fracture is brittle.

The Effects of Transient Temperature around Welds on Mechanical Properties of A36 Steel Plate

There are various ways for welding experts to improve their production quality, and one of which is by designing a particular type of welding tool. Besides aiming to replace the function of operator’s body parts, the tool is also able to control buckling distortions, crack propagations, and stress voltage, as well as to save an additional work, which is the heat treatment after welding process. The best method to control buckling distortions from the thin plate is by applying pre-heating and thermal tensioning. Thermal tensioning is the characterization by heat application during welding process. Transient thermal tensioning is a supporting tool around the weld which is given periodical heat by following the movement of arc welding. The purpose of this research was to minimize distortions and maximize the performance (mechanical properties) of welding joints shaped due to the transient temperature application during the welding process. The method employed in this research was experiment by using A36 steel plate with transient temperature variation of 100, 200, and 300oC, with velocity of 8 mm/s and heater (toutch) distance of 4, 6, and 8 cm. In this research, the researcher conducted tensile-strength test according to the JIS G 3101 standard and hardness test around weld, HAZ (Heat Affected Zone), and parent metal.The findings showed that the change of transient temperature and heater distance affected the mechanical properties (hardness and tensile strength) of A36 steel. The highest level of hardness was obtained in the temperature of 200°C and heater distance of 6 cm, which was as much as 404 VHN. The highest level of tensile strength was obtained in the temperature of 200°C and heater distance variation of 8 cm with yield stress of 302 Mpa and maximum tensile strength of as much as 491 Mpa.