Las Busur Kd 4 (32) Ingg
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Transcript of Las Busur Kd 4 (32) Ingg
Teknologi Dan Rekayasa
SHIELDED METAL ARC WELDING(SMAW)
Teknologi dan Rekayasa
SHIELDED METAL ARC WELDING EQUIPMENT
OBJECTIVE :After studying this lesson, the students can be to :1. identify of welding equipments2. explain the name of welding equipments3. select for welding equipments 4. explain welding equipments setting
Teknologi dan Rekayasa
SHIELDED METAL ARC WELDING EQUIPMENT
UNDERSTANDING :
Shield metal arc welding is a process where coalescence is achieved by generating an electric arc between a coated metallic electrode and the work piece.
Teknologi dan Rekayasa
SHIELDED METAL ARC WELDING SHIELDED METAL ARC WELDING EQUIPMENTEQUIPMENT
Fig. 1. Shield metal arc welding process
Teknologi dan Rekayasa
Application :
The Shielded Metal Arc Welding process is used extensively in welding both ferrous and non ferrous metals.
Shielded Metal Arc Welding is universal in repairing and servicing equipment.
SHIELDED METAL ARC WELDING EQUIPMENT
Teknologi dan Rekayasa
The general of welding equipment are three kinds :
1. Main equipment
2. Assist equipment
3. Health and safety equipment
SHIELDED METAL ARC WELDING EQUIPMENT
Teknologi dan Rekayasa
The basic units of any shielded metal arc welding system consist of :
1. Power Supply
2. Electrode holder
3. Ground clamp
4. Power cable
5. Protective shield
THE MAIN WELDING EQUIPMENT
Teknologi dan Rekayasa
1. Power SupplyThe three basic welding machines are referred to as generators, transformers and rectifiera. DC generator : The direct current power supply consist of a generator driven by an electric motor or a gasoline engine. One of the characteristics of a direct current welding generator is that the welding can be done with straight or reverse polarity
THE MAIN WELDING EQUIPMENT
To identify this DC machine
Teknologi dan Rekayasa
Fig. 2. DC-welding machine
THE MAIN WELDING EQUIPMENT
In straight polarity the electrode is negative and the work piece positive and electrons flow from the electrode to the work piece.
Teknologi dan Rekayasa
STRAIGHT POLARITY (DCSP)
GENERATOR
+ -
WORK
Fig. 3. DCSP-welding machine connections
THE MAIN WELDING EQUIPMENT
In reverse polarity the electrode is positive and the work piece negative and the electrons flow from the work piece to the electrode.
Teknologi dan Rekayasa
GENERATOR
+ -
WORK
Fig. 4. DCRP-welding machine connections
REVERSED POLARITY (DCRP)
THE MAIN WELDING EQUIPMENT
b. Transformer : The transformer type of welding machine produces alternating current where power is taken directly from a power supply line and transformed into a voltage required for welding. In its simplest form an AC transformer consists of a primary and secondary coil with an adjustment to regulate the current out put.
Teknologi dan Rekayasa
THE MAIN WELDING EQUIPMENT
Teknologi dan Rekayasa
Fig. 5. AC-welding machine
To identify this AC machine
THE MAIN WELDING EQUIPMENT
Teknologi dan Rekayasa
c. Rectifier :
Rectifier is essentially transformers containing an electrical device which changes alternating current into direct current.
Rectifier are made to provide DC current only or both DC and AC welding current.
THE MAIN WELDING EQUIPMENT
To identify this AC/DC machine
Teknologi dan Rekayasa
Fig. 5. AC/DC welding machine.
THE MAIN WELDING EQUIPMENT
2. Electrode HolderThe electrode holder is used to hold the electrode and guide it over the seam to be welded.
Teknologi dan Rekayasa
Fig. 6. Electrode Holder
THE MAIN WELDING EQUIPMENT
3. Ground Clamp
A very important unit of any electrical welding equipment is the ground clamp. Without proper grounding the full potential of the circuit will fail to provide the required heat for welding
Teknologi dan Rekayasa
Fig.7. Ground Clamp
THE MAIN WELDING EQUIPMENT
4. Power cablePower cable selection that will be used should appropriate with the burden, it is ampere and input tension voltage regulator includes : wire size, long wire and type wire (fiber or not)
THE MAIN WELDING EQUIPMENT
Fig. 8. Power cable
Teknologi dan Rekayasa
5. Protective shieldA suitable helmet or handshield is required for all arc welding.An electric arc produces a brilliant light and also gives invisible ultraviolet and infrared rays which are extremely dangerous to the eyes and skin.Both the helmet and hand shield are equipped with special colored lenses that reduce the brilliancy of the light and screen out the infrared and ultraviolet rays.
THE MAIN WELDING EQUIPMENT
Teknologi dan Rekayasa
Lenses come in different shades and the types used depends on the kind of welding done.
In general, the recommended practice is:Shade 5 : for light spot weldingShade 6 and 7: for welding up to 30 amperesShade 8 : for welding 30 to 75 amperesShade 10 : for welding 75 to 200 amperesShade 12 : for welding 200 to 400 amperesShade 14 : for over 400 amperes
THE MAIN WELDING EQUIPMENT
Teknologi dan Rekayasa
Fig. 9. Protective Shielded
Lens
Clear lens
Clear lensFilter lens
THE MAIN WELDING EQUIPMENT
WELDING TABLE
CHINDER HAMMER
CURVE HAMMER
HAND GRINDSTONE
1
2
3
4
ASSIST WELDING EQUIPMENT
1. Welding table Welding table is place to put work think in position
ASSIST WELDING EQUIPMENT
2. Chinder hammer
Chinder hammer is a tool for cleaning chinder from welding product
ASSIST WELDING EQUIPMENT
3. Curve hammer
Curve hammer is used to straighten, levelling the surface of curve or bend work think.
ASSIST WELDING EQUIPMENT
4. Hand Grindstone
Its function is to prepare materials that will be welding, it is preparing welding shawl, it is also used to support in welding process specially in cleaning welding product
ASSIST WELDING EQUIPMENT
HEALTH AND SAFETY EQUIPMENT
1. WELD 1. WELD CLOTHES
2. APPRON (2. APPRON (CHEST PROTECTOR)
3. 3. GLOVES
4. LEATHER 4. LEATHER SHOES
1. Weld Clothes
By wearing this clothes, welder will fill comfort and free in movement
HEALTH AND SAFETY EQUIPMENT
2. Apron (Chest protector)
Appron is used to protect welder chest from UV ray, infra red, weld fire work sprinkling and the hot of welding.
HEALTH AND SAFETY EQUIPMENT
3. GlovesGloves it used to protect welder hand from electricity, the of welding and sharp material.
HEALTH AND SAFETY EQUIPMENT
4. Leather ShoesThis shoes made of leather that there is metal in top of it, this shoes will protect welder from electricity, downfall material, hot material and sharp material.
HEALTH AND SAFETY EQUIPMENT
Teknologi dan Rekayasa