Arc Welding Techniques and Metal preparation. Objectives Understand Basic Welding techniques...
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Transcript of Arc Welding Techniques and Metal preparation. Objectives Understand Basic Welding techniques...
![Page 1: Arc Welding Techniques and Metal preparation. Objectives Understand Basic Welding techniques Understand the types of welds.](https://reader030.fdocuments.us/reader030/viewer/2022032702/56649cc15503460f94988ac9/html5/thumbnails/1.jpg)
Arc Welding Techniques and Metal preparation
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Objectives
• Understand Basic Welding techniques • Understand the types of welds
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Metal Preparation
• Free of dirt, grease, rust, paint, or other impurities• Can Weaken the
weld
• Clean by grinding, brushing, filing, or cutting
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Welding Joints
• Butt, lap, tee, corner, and edge.
• Types of welds: • fillet, groove, plug,
slot, and surface
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• Tee weld is a type of fillet weld.
• The fillet weld • has two surfaces at
right angles, • the bead is triangular
in shape
• The groove weld • A weld made in a
groove between the two pieces of metal
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Plug and Slot welds
• Used to join pieces that overlap.
• The welds are placed in plug or slot holes.
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Surface Welds
• Beads deposited on a metal surface • the purpose of
building up the base metal.
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Butt Joint
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Single and Double V Butt Joint
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Single Beveled Butt Joint
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Lap Joints
•
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Corner Joint
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Edge Joint
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Major Factors for Quality Welding • 1. The proper
amperage• When correct, a
sharp crackling sound can be heard.
• Too Low: Humming
• Too Loud: Popping
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Major Factors for Quality Welding• 2. the thickness of
the base metal and the diameter of the electrode.
• 3. Arc Length • equal to the
diameter of the bare end of the electrode.
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Major Factors for Quality Welding• 4 Electrode Angle
• Hold the electrode at a 90 degree angle of the two plates being joined
• 5 to 15 degrees in the direction of travel.
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Major Factors for Quality Welding• 5. Speed of Travel
• It should produce a bead that is 1.5 to 2 times the diameter of the bare end of the electrode.
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Welding Procedures
1. Make sure safety is being followed
2. Insert the electrode in the electrode holder and hold it about 1 inch above the metal
3. Turn Welder on
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Welding Procedures
4. Lower the helmet, bring the electrode in contact with the work and withdraw it slightly.
• The metal and the electrode melt forming a metal pool called a crater
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Welding Procedures
• 8. There are two methods used in starting the arc.• striking like a
match.• tapping the
electrode quickly on the surface to prevent it from sticking
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Welding Procedures
• 9. Raise the tip of the electrode to about 3 /16 inch above the base metal. This forms a long arc which is held for a three count in order to preheat the base metal.
• 10. Lower the electrode to the correct arc length.
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Welding Positions
• Vertical
• Horizontal
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Welding Positions
• Flat
• Overhead