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Abstrak :
Pengelasan merupakan salah satu metode penyambungan dalam bidang manufaktur untuk digunakan dalam suatu proses pembuatan produk. Pengelasan adalah penyambungan logam dengan mencairkan logam induk dan logam pengisi dengan atau tanpa tekanan dan dengan atau tanpa logam penambah menghasilkan sambungan pada logam tersebut. Micro Friction Stir Spot Welding MFSSW adalah jenis pengelasan skala mikro yang menggunakan proses gesekan pada suatu titik dalam pengelasannya. Pada penelitian ini mencari pengaruh geometri lasan dari hasil pengelasan MFSSW terhadap sifat mekanik pada Plat Aluminium AA1100. Diperoleh bahwa besaran geometri yaitu, diameter belakang back diamater, luas selimut dan kedalaman hasil pengelasan plunge depth berbanding lurus dengan beban puncak gaya geser Shear Load. Semakin luas, semakin dalam, dan semakin besar diameter belakang back diameter hasil pengelasan maka nilai beban puncak semakin besar, sementara itu untuk deviasi diameter keyhole akibat adanya vibrasi tidak menunjukan pengaruh terhadap shear load. ......Welding is one of joining method in the field of manufacturing which is used in a product manufacturing process. Welding is the bonding of metal by liquefying the parent metal and filler metal with or without pressure and with or without the adder metal resulting in a connection to the metal. Micro Friction Stir Spot Welding MFSSW is a type of micro scale welding that uses the friction process at a point in its welding. In this research looking for the influence of weld geometry from MFSSW welding result to mechanical properties on AA1100 Aluminum Plate. It is found that the magnitude of the geometry ie, back diameter, blanket width and the depth of the weld plunge depth is directly proportional to the shear load peak. The wider, deeper, and larger back diameter the higher peak load value, meanwhile for the deviation of the keyhole diameter due to vibration, does not show the effect on the shear load.

Abstrak :
Torch brazing adalah salah satu metode brazing berdasarkan sumber panas. Metode ini dalam proses penyambungan logam tergolong liquid-solid state thermochemical dan pada umumnya digunakan dalam penyambungan pipa. Proses brazing ini memanaskan logam pengisi hingga mencapai titik leleh tanpa melampaui titik leleh logam dasar yang akan disambung. Logam pengisi akan memberikan sambungan yang kuat pada logam dasar setelah mengalami pendinginan. Pemberian tekanan dan panjang lap joint pada proses brazing akan berpengaruh pada kualitas sambungan. Pada penelitian ini akan diketahui pengaruh tekanan dan panjang lap joint terhadap kekuatan sambungan pipa baja rendah karbon bundy dan tembaga C1100T. Konfigurasi yang paling optimal pada panjang lap joint akan diketahui dari hasil beban tarik. Beban tarik dan jarak antar sambungan adalah faktor yang mempengaruhi kekuatan dari sambungan brazing. Hasil penelitian menunjukkan tekanan memiliki pengaruh lebih besar daripada panjaang lap joint terhadap logam tak sejenis menggunakan torch brazing. ......Torch brazing is one method of brazing based on the heat source. This method as the process of joining metals in classified as liquid-solid state thermochemical and generally used in the joining pipe. This process heats the brazing filler metal until it reaches the melting point without exceeding the melting point of the base metals to be joined. The filler metal will give strong joining to the base metal after cooling. Giving pressure and length of lap joint in the brazing process will affect the quality of the joining. This research will investigate the effect of pressure and length of lap joint to joint strength of low carbon steel bundy tube and C1100T copper. The most optimal configuration between length of lap joint will be known from the result of shear load, which are the factors that affect joint strength of brazing. The result shows that the pressure have effect bigger than length of lap joint for dissimilar metal using torch brazing.

Abstrak :
Torch brazing is one method of brazing based on using a heat source for joining metals. This method is classified as a liquid-solid state thermochemical process and is generally used in joining pipes. This process heats the brazing filler metal until it reaches the melting point without exceeding the melting point of the base metals to be joined. After cooling, the filler metal grants a strong joining capacity to the base metal. Depending on the amount of pressure and the length of lap joint in the brazing process the quality of the joint will be affected. This research will investigate the effect of pressure and the length of the lap joint on the material strength properties of BJ DD2 steel and C12000 copper. An optimal configuration between pressure and the length of lap joint will be determined from the result of shear load and joint clearance, which are the factors that affect joint strength and the process of brazing. The greater the shear load and the smaller the joint clearance, the higher the joint strength will be. The result shows that the pressure has a larger effect than the length of the lap joint for dissimilar metal joining using torch brazing.