Teknologi LAS KAPAL Applications gas welding oxyacetylene for

Teknologi LAS KAPAL Applications gas welding (oxyacetylene) for plate

Types of Welded Joints v v v Butt joint Corner joint Edge joint Lap joint Teknologi dan Rekayasa

Types of Welded Joints Teknologi dan Rekayasa

Square Butt Joints v Used to butt weld light sheet metal v 1/16 to 3/16 thick metal Teknologi dan Rekayasa

Beveled Butt Joints v Used to butt weld heavier pieces of metal together v 3/8 to ½ inch metal can welded using a single V or U joint. v ½ Inch metal and up can be welded using a double V or U joint Teknologi dan Rekayasa

Beveled Cont. Teknologi dan Rekayasa

Corner Joints v Used to join to pieces of metal that are approximately right angles to each other v Closed corner joint is used on light sheet metal were strength is not a required at the joint v Half open corner joint is used on heavier metal when welding can only be done on one side. Used when load is not severe Teknologi dan Rekayasa

Corner Cont. v Open corner joint is used on heavy material. It is the strongest of the corner joints v Corner joints on heavy material are welded on both sides. The outside first them reinforced on the inside Teknologi dan Rekayasa

Corners Cont. Teknologi dan Rekayasa

Edge Joints v Used to join two parallel or nearly parallel pieces of metal. Not very strong v Used mainly to join edges of sheet metal, reinforce flanges of I beams, and mufflers Teknologi dan Rekayasa

Edge Joints Teknologi dan Rekayasa

Lap Joints v Used to join two overlapping pieces of metal v Single lap joint welded from one side v Single lap joint welded from two sides develops full strength v Off set lap joint is used when two pieces of metal need to be joined in the same plain Teknologi dan Rekayasa

Lap Joints Cont. v A- single lap joint, one weld v B- single lap joint, two welds v C- offset lap joint Teknologi dan Rekayasa

Tee Joints v Used to join two pieces of metal that are approximately 90 degrees to each other, but the surface of one piece of metal is not in the same plain as the other metal Teknologi dan Rekayasa

Tee Joints Cont. v A- plain tee v B- single beveled v C- double beveled v D- single J v E- double J Teknologi dan Rekayasa

Types of Welds v Fillet weld- basic weld used. Used when joining two pieces of metal without preparing the surface of the metal first v Groove weld- basic weld, used when preparing the metal before welding it into place Teknologi dan Rekayasa

Fillet Welds Teknologi dan Rekayasa

Groove Welds Teknologi dan Rekayasa

Gas welding v Sound weld is obtained by selecting proper size of flame, filler material and method of moving torch v The temperature generated during the process is 33000 c v When the metal is fused, oxygen from the atmosphere and the torch combines with molten metal and forms oxides, results defective weld v Fluxes are added to the welded metal to remove oxides v Common fluxes used are made of sodium, potassium. Lithium and borax. v Flux can be applied as paste, powder, liquid. solid coating or gas. Teknologi dan Rekayasa

Gas welding equipment 1. Gas Cylinders Pressure Oxygen – 125 kg/cm 2 Acetylene – 16 kg/cm 2 2. Regulators Working pressure of oxygen 1 kg/cm 2 Working pressure of acetylene 0. 15 kg/cm 2 Working pressure varies depends upon the thickness of the work pieces welded. 3. Pressure Gauges 4. Hoses 5. Welding torch 6. Check valve 7. Non return valve Teknologi dan Rekayasa

Oxy-Acetylene welding Teknologi dan Rekayasa

Types of flames v Oxygen is turned on, flame immediately changes into a long white inner area (Feather) surrounded by a transparent blue envelope is called Carburizing flame (30000 c) v Addition of little more oxygen give a bright whitish cone surrounded by the transparent blue envelope is called Neutral flame (It has a balance of fuel gas and oxygen) (32000 c) v Used for welding steels, aluminium, copper and cast iron v If more oxygen is added, the cone becomes darker and more pointed, while the envelope becomes shorter and more fierce is called Oxidizing flame v Has the highest temperature about 34000 c v Used for welding brass and brazing operation Teknologi dan Rekayasa

Neutral flame Three basic types of oxyacetylene flames used in oxy fuel gas welding operations: (a) neutral flame; (b) oxidizing flame; (c) carburizing, or reducing flame. Teknologi dan Rekayasa

Oxidizing flame Three basic types of oxyacetylene flames used in oxy fuel gas welding operations: (a) neutral flame; (b) oxidizing flame; (c) carburizing, or reducing flame. Teknologi dan Rekayasa

Carburizing or reducing flame Three basic types of oxyacetylene flames used in oxy fuel gas welding operations: (a) neutral flame; (b) oxidizing flame; (c) carburizing, or reducing flame. Teknologi dan Rekayasa

Welding is a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the application of pressure or by the application of pressure alone, and with or without the use of filler material. Welding is used for making permanent joints. It is used in the manufacture of automobile bodies, aircraft frames, railway wagons, machine frames, structural works, tanks, furniture, boilers, general repair work and ship building. Teknologi dan Rekayasa

PROSES LAS BRAZING Teknologi dan Rekayasa

PERALATAN BRAZING Teknologi dan Rekayasa

SAMBUNGAN BRAZING Teknologi dan Rekayasa

PIPE BRAZING Teknologi dan Rekayasa

SAMBUNGAN BRAZING Teknologi dan Rekayasa

PIPE BRAZING Teknologi dan Rekayasa

MACAM SAMBUNGAN Teknologi dan Rekayasa

Gas welding process Teknologi dan Rekayasa

Gas welding application Teknologi dan Rekayasa

Review v What are the types of joints? v What is the strongest of the corner joints? v Name the two types of welds we will use? v how much Types of flames ? Teknologi dan Rekayasa

Study Hard Teknologi dan Rekayasa