Bab 27 fusion welding

fusion welding

Joining Processes Joining Processes and Equipment and Equipment Introduction Introduction Ir. Tri Prakosa, M. Eng. Proses Manufaktur II, Januari 2010 [...]... metals, which are metals added to the weld area during welding of the joint, may or may not be used  Fusion welds made without the addition of filler metals are known as autogenous welds 13 Institut Teknologi Bandung OXYFUEL GAS WELDING 14 Institut Teknologi Bandung Oxyfuel gas welding /OFW  Oxyfuel gas welding (OFW) is a general term used to describe any welding process that uses a fuel gas combined with... supplies 32 Institut Teknologi Bandung Arc welding  This arc produces temperatures in the range of 30,000 °C (54,000 °F), which is much higher than those developed in oxyfuel gas welding  Arc welding includes various welding processes, which are described below 33 Institut Teknologi Bandung Shielded metal-arc welding (Las Busur Listrik)  Shielded metal-arc welding (SMAW) is one of the oldest, simplest,...INTRODUCTION 11 Institut Teknologi Bandung  The welding processes described in this chapter involve partial melting and fusion of the joint between two members  Fusion welding is defined as melting together and coalescing materials by means of heat  The thermal energy required for these welding operations is usually supplied by chemical or electrical means 12 Institut... being portable, versatile, and economical for low-quantity and simple work  Proper operator training and skill are essential 30 Institut Teknologi Bandung ARC -WELDING PROCESSES: CONSUMABLE ELECTRODE 31 Institut Teknologi Bandung Arc welding  In arc welding, developed in the mid-18OOs, the heat required is obtained through electrical energy  Using either a consumable or nonconsumable electrode (rod or... maintenance welding is performed by this process  The electric arc is generated by touching the tip of a coated electrode against the workpiece and then withdrawing it quickly to a distance sufficient to maintain the arc 34 Institut Teknologi Bandung Las Busur Listrik (Shielded Metal- Arc Welding/ SMAW) Ilustrasi skematik proses pengelasan dengan elektroda terselubung (shielded metal-arc welding) Sekitar... industri ukuran besar menggunaan proses ini Ilustrasi skematik operasi shielded metal-arc welding (dikenal juga sebagai stick welding, karena bentuk elektroda berupa batang) 35 Institut Teknologi Bandung Las Busur Listrik/SMAW  The electrodes are in the shape of thin, long sticks, so this process is also known as stick welding  The heat generated melts a portion of the tip of the electrode, its coating,... Oxygen and acetylene cylinders have different threads, so hoses cannot be connected to the wrong cylinders  Gas cylinders should be anchored securely and should not be dropped or mishandled 27 Institut Teknologi Bandung Welding Torch yang digunakan pada Pengelasan Oxyacetylene  (a) Gambar umum dan (b) penampang torch yang digunakan pada pengelasan oxyacetylene Pertama kali katup acetylene dibuka; gas dinyalakan... process that uses a fuel gas combined with oxygen to produce a flame  This flame is used as the source of heat to melt the metals at the joint  The most common gas welding process uses acetylene fuel (Karbit), is known as oxyacetylene welding and is used typically for structural sheetmetal fabrication and automotive bodies and various other repair work 15 Institut Teknologi Bandung  Developed in... c) Carburizing Flame 21 Institut Teknologi Bandung Types of flames  Other fuel gases such as hydrogen and methylacetylene propadiene can be used in oxyfuel gas welding  However, the temperatures developed are low, and hence they are used for welding metals with low melting points, such as lead, and parts that are thin and small  The flame with hydrogen gas is colorless, making it difficult to adjust... Types of flames  Other gases, such as natural gases, propane, and butane, are not suitable for oxyfuel welding because of the low heat output or because the flame is oxidizing 23 Institut Teknologi Bandung Filler metals  Filler metals are used to supply additional material to the weld zone during welding  They are available as rods or wire, and are made of metals compatible with those to be welded . Bandung13 OXYFUEL GAS WELDING OXYFUEL GAS WELDING Institut Teknologi Bandung14 Oxyfuel gas welding /OFW Oxyfuel gas welding /OFW  Oxyfuel gas welding (OFW) is. Bandung11  The welding processes described in this chapter involve partial melting and fusion of the joint between two members.  Fusion welding is defined