- 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.
Posts Tagged ‘resistance spot welding’
Projection Welding Advantages
Friday, January 22nd, 2010
Spot Welding Overview
Thursday, January 7th, 2010Spot 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
Welding Tips
Tuesday, September 1st, 2009Welding is mostly used for fabrication process. Welding means to merge two particles into one by melting and cooling processes. Welding can be heated through gas flame, electric arc, laser, electron beam and ultrasound. Welding can be done in open air, underwater and in space. But welding is considered dangerous. Unless proper precautions are taken, a welding operator may be exposed to burns, electric shock and ultraviolet rays.
Different types of welding:
There are various types of welding. One of the oldest methods is forge welding. Many people stopped using this method by the end of 19th century, when arc welding was developed. In oxy fuel welding, fuel gases and oxygen is used for welding purpose. Other important types include resistance welding, gas metal arc welding, submerged arc welding, flux core arc welding, electro slag welding, laser beam welding, electron beam welding and robot welding.
Some safety tips are as follows:
- Welding process requires heating, so remove all the inflammable materials near the vicinity.
- Wear protective gear to avoid injury caused by fire or gas.
- Fire extinguisher should be in operating condition
- Proper ventilation can avoid accumulation of toxic materials
- A welding operator should always wear woolen clothes instead
of cotton as it can catch fire easily. - In extremely dangerous cases of welding, the person doing the welding process should wear flameproof jackets to avoid fire.
Overview of Resistance Spot Welding
Thursday, August 13th, 2009Resistance 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 heat
ing 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.
What is Resistance Spot Welding?
Friday, June 26th, 2009Spot 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
Safety Measures to be Followed While Doing Resistance Spot Welding
Thursday, June 25th, 2009Spot Welding can lead to fire, burns or explosions
- Flying sparks, hot equipment or hot work piece can cause fire or burns. Protect yourself from sparks and hot metal.
- Welding sparks can move to small cracks easily. Be alert while welding.
- Always keep a fire extinguisher in the welding room.
- Avoid spot welding in closed containers.
- Once your welding work is over, make sure that the area is free of sparks and flames.
- Make sure you use correct circuit breakers.
Electric shock can cause severe burns to the skin or kill a person
- See to it that you do not touch any electrical equipment while it is on.
- Always wear welding gloves and protection clothes while spot welding.
- Turn off all the electrical equipments when not in use.
- Make sure all the electrical equipments are well maintained. In case
of any repairs rectify it at once. - Make sure you keep all panels and guards in a protected place.
Sparks can burn or injure eyes and skin
- Always wear face shield or safety goggles while welding.
- Wear protective clothes like heavy shirt, cuff less trousers, high shoes, leather gloves and a cap while welding.
- Avoid clothing made of synthetic materials.
- Protect your eyes and face by wearing a welding helmet.
Wear gloves while working with Hot metals
- Make sure you wear insulated gloves while using this equipment.
- Avoid touching tips, tongs with bare hands.
- Cool tongs and tips before touching.
Moving parts like tongs, tips and linkages can injure fingers and hands
- Be away from moving parts and pinch points.
- Avoid putting hands between tips.
Cleaners, paints and plating can cause fumes which are hazardous
- Avoid breathing these fumes.
- If inside, ventilate the area to remove fumes.
- In limited space, always keep a respirator.
- Always read the manufacturer’s manual carefully.
An Overview of Spot Welding
Sunday, January 18th, 2009Spot 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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