Posts Tagged ‘spot welding’

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Short note on spot welding:

Wednesday, July 21st, 2010

There are many kinds of welding such as Mig welder, Tig welder, Arc welder and many others. You can also find few resistances welding such as spot welding. Spot welding is mostly used for welding sheet metal fabricators. It is a process of touching the surface of metals by heat which is joined with another metal where the heat is generated from electric flow to resistance.

These welding are one of the oldest and were known as projection welding. These are very useful while welding for thin foils. These are energy efficient and also can weld in high speed. This welding equipment has an ease of automation and are very easy to handle. These are used for many kinds of applicators such as automobile industry, orthodontist and many other industries. You can spot weld the aluminum alloy with the use of powerful welding transformer. This is very useful for welding the sheet metal for cars and can weld automatic with the help of robot. These are also utilized for joining the cells of batteries with nickel straps. The battery might get hot while soldering but nothing will happen if you use spot welding.

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Projection Welding Advantages

Friday, January 22nd, 2010
  • Simultaneously we can make any number welds in heavier materials easily.
  • Projection welds can be made in metals that are too thick to be joined by spot welding.
  • When you compare with spot welding, projection welding interferes less scale, oil, rust and work metal coatings.
  • Lower Electrode Maintenance.
  • Less Welding Current Required.
  • Projection welding life is longer than spot welding.
  • Lower amount of current and pressure needs to joint metals.
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Spot Welding Overview

Thursday, January 7th, 2010

Spot Welding is a method of joining two metal sheets. The two metal parts are held between the electrodes and heat generated at the interface between two sheets causes
local welding when pressure is applied.

Benefits of Spot Welding

  • High Speed
  • Easy to Operate
  • Energy Efficiency
  • Save valuable floor space
  • Cost Effective
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Spot Welding Hazards

Thursday, September 10th, 2009

Spot welding can cause fire

  • Keep a fire extinguisher near while working
  • Use correct circuit breakers
  • Flying sparks and hot metal may be dangerous. Protect yourself and others from these flammable materials.
  • Avoid spot welding in closed containers such as tanks or drums.
  • Before welding, see to it that you don’t have any matches in your pocket.
  • Do not exceed the equipment rated capacity.

Electric shock can kill:

  • Always wear dry, insulating gloves
  • Avoid touching live electrical parts
  • Turn off electrical equipment when not in use.
  • Always use well-maintained equipment. Repair or replace damaged parts at once.
  • Keep cords dry, free of oil and grease, and protected from hot metal and sparks.

Flying sparks can cause injury

  • Wear face shield or safety goggles with side shields
  • Wear protective garments like heavy shirt, high shoes, cap etc. Avoid wearing synthetic material.

Hot Metal can cause burns

  • Wear gloves while touching work piece, tips or tongs.
  • Allow tongs and tips to cool before touching.

Moving parts can cause injury

  • Keep away from moving parts and pinch points
  • Do not put hands between tips.

Fumes can be hazardous

  • Do not breathe the fumes
  • Always use respirator
  • Read the Material Safety Data Sheet (MSDS).
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Overview of Resistance Spot Welding

Thursday, August 13th, 2009

Resistance spot welding is one of the oldest techniques used in industry today. Welding is done with a combination of heat, pressure and time. As the name implies, it is the resistance of the material to be welded to current flow that causes a localized heatresistance-spot-welding3ing in the part. The pressure is exerted by tongs and tips.

Resistance spot welding produces little fumes and arc rays. Even flying sparks is low when compared to other process. Flying metal and sparks can injure eye or face. Resistance spot welding occurs when current flows through the tips and the separate pieces of metal to be joined.

Some of the safety hazards of resistance spot welding are as follows:

  • Flying sparks can cause fire and explosion.
  • Electric shock from wiring is a possible hazard.
  • Hot metals and parts can cause burns.
  • Some moving parts like tongs, tips and linkages can cause injury to fingers and hands.

Some ways to avoid hazards are as follows:

  • Always wear safety goggles and long sleeve shirts.
  • Keep a fire extinguisher nearby.
  • Wear dry insulating gloves.
  • Do not put hands between tips.
  • Do not breathe the fumes.
  • Use proper ventilation.
  • Do not touch tongs and tips with bare hands.
  • Touch them only after it gets cooled.
  • Wear proper insulating gloves if handling hot work or parts is necessary.
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What is Resistance Spot Welding?

Friday, June 26th, 2009

Spot welding means joining two or more metals parts together with the help of heat and pressure. It is considered one of the oldest welding processes. This type of welding can be used to weld thin or thick foils but cannot be used for above about 6 mm thickness. High quality welds can also be made in stainless steels, nickel alloys, aluminum alloys and titanium.

Resistance spot welding produces little fumes and very less arc rays. Danger of flying sparks is less when compared to other processes. But tongs and linkages can cause higher risk of mechanical hazards such as pinching and crushing the fingers and hands.

Resistance is the opposition that a substance offers to the flow of electric current. If the metal has lesser resistance, less heat is generated when current passes through it. The higher the resistance of a metal, the more heat is generated when the same current passes through it. If you want best results in resistance welding you should have a detailed understanding of the materials being welded, careful control of the heat and pressure at the weld point, and consideration of numerous other factors.

Benefits of Resistance Welding

  • High speed welding
  • Easily automated
  • Suitable for high rate production
  • Economical
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An Overview of Spot Welding

Sunday, January 18th, 2009

Spot welding is one of the very old processes that people have used for welding. It is done through combining heat with pressure and time. The weld is done through using a current flow through the resistance of the material so that it localized heat in one spot. The amount of time that the current flows into the joint is determined by the thickness and type of material that is being used in the weld.

Another name for spot welding is resistance spot welding and it is one of the few processes that produce small amounts of arc rays and fumes. There are tongs and linkages that are used so an individual must be careful around the equipment for their own safety. Although there are fewer problems it is still wise to wear safety equipment.

The Process of Spot Welding

When a welder is doing spot welding the point is to have the current flow through the very tip of the metals to be joined. The base metal will resist the electrical current which makes the heat focus directly on the join that you want to have welded. The process is unique because you will see that the weld bead is created inside the surface of the base metal. This is different from a TIG or MIG spot weld because the resistance process uses electrodes that are attached to both sides of the work pieces that you want to weld.

Protect Yourself

It is very important to understand some of the safety hazards that can happen with resistance spot welding. As said before the weld is made inside the work pieces so this is not an open-arc process. Here are two common hazards that you should know how to protect yourself from:

You may have flying sparks. You will need to keep a fire extinguisher close and be skilled at using it. Besides causing fires or explosions they can also fly off the weld joint so you need to wear safety goggles and long sleeves. Otherwise you will risk burns to your face and to your body.

Electric shock should be considered. Since you are working with wiring electric shock is always a possibility. To cut down the hazard it is always a good idea to wear insulated gloves.

Keep in mind that spot welding is a very important skill to learn but you must be safe doing it.

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