Spot welding is a very common form of resistance welding. In this welding process, sheet metals that are up to 3mm thick can be joined. The reason why this welding process is very effective is because of the concentrated area of welding that is taken in when the welding process happens. This method makes efficient use of energy and does not waste energy by making long welds. Welding is done in spots, as per the name, which forms hard thick joints which are very effective in holding the two metals together. This method of welding makes it easy to work with limited workspace and also increases the production rate. There are no filler elements required in this form of welding and the whole process can be easily automated. It should be remembered that the weld strength of this process is comparatively lesser than the other welding methods and hence this method is only suitable in certain applications.
Posts Tagged ‘resistance spot welding’
Spot welding
Thursday, May 26th, 2011Solid state welding
Wednesday, May 25th, 2011This is a welding technique that does not melt the metal to make the weld. This type of welding is normally done to make electrical connections out of aluminum or copper. This is almost similar to resistance welding but instead of heat that is used to melt the metals, the energy is provided in form of vibrations. The metals pieces in high pressure join with each other under the influence of the vibrations. When plastic materials are joined like this, it should be kept in mind that both the materials should have the same melting points. Also, when joining plastics, the vibrations are introduced vertically under high pressure. Examples of solid state welding can be ultrasonic welding and explosion welding. With the metals not welding under heat, there is no wastage of metals and also the weld is much cleaner without any marks or deformation in the line of weld as the other forms of welding.
Resistance welding
Tuesday, May 24th, 2011Resistance welding is a welding process that is used to join two or more metals. In this process, heat is generated with the help of the property of resistance between the two metals. When the two metals are in contact, a high current of 1000 A to 10,000 A is passed and heat is generated by the resistance property of the two metals. This heat will cause the metals to melt and small pools of molten metal will be formed. When these pools are cooled down, they form a hard metal bond between the metals which would create a perfect weld. This welding process is very efficient and it causes the least amount of pollution. However, the cost of equipment for resistance welding is quite high. There are many processes that are included under resistance welding. Spot welding is a very famous form of resistant welding that makes use of this welding process to make clear concentrated welds.
Various types of electrodes used in Spot Welding:
Monday, January 3rd, 2011Spot welding can be termed as a procedure in which the contacting metal facades are combined together by the temperature produced from resistance to thrilling current stream. Generally, the method utilizes 2 copper alloy electrodes to deliberate welding energy into a tiny stain and at the same time compact the sheets together. The amount of electrical energy is selected to counterpart the sheet’s substance properties, its size and kind of electrodes.
Keep in mind that if you use little amount of energy then you will not be able to melt metals otherwise get a poor joint. On the other hand if you apply excess of energy then it will over dissolve metal and make a mess than a joint. So it is necessary to use required amount of energy. Electrodes that are utilized in spot welding can vary significantly with diverse applications: When it comes to high heat applications, radius style electrodes are utilized. Condensed tip electrodes are used for high pressure, whereas eccentric electrodes used for welding corners. Offset peculiar tips used for reaching into corners and minute spaces.
Spot Welding- A Unique Welding Process:
Wednesday, December 22nd, 2010Spot welding is one of the very unique techniques of welding that people have used. This welding is performed by combining heat with pressure and time. Further to this, the process is carried on by using a current flow through the confrontation of the material so that it localizes heat in one spot. The amount of time taken by the current to flow into the joints is based on the thickness and the type of metal that is going to be welded. The main advantage of this type of welding is that the entire sheet does not get heated up during the process as it takes very few milliseconds for lot of energy to flow to the spot to be welded.
Spot welding is also known as resistance spot welding as it is one of the few welding procedure which generates fewer amounts of arc rays and fumes. As tongs and linkages are used, welders have to protect themselves for their own safety from the equipments that are kept around. Hence it is advisable to wear safety equipment before performing the welding activity.
When a welder performs spot welding he has to make sure that the current is flowing through the tip of the metals which are going to be joined. This process of welding is unique as you observe that the welded bead is formed inside the surface of base metal. This process of welding is different from a TIG or MIG spot welding.
Spot Welding- A Unique Welding Process:
Monday, December 6th, 2010Spot welding is one of the very unique techniques of welding that people have used. This welding is performed by combining heat with pressure and time. Further to this, the process is carried on by using a current flow through the confrontation of the material so that it localizes heat in one spot. The amount of time taken by the current to flow into the joints is based on the thickness and the type of metal that is going to be welded. The main advantage of this type of welding is that the entire sheet does not get heated up during the process as it takes very few milliseconds for lot of energy to flow to the spot to be welded.
Spot welding is also known as resistance spot welding as it is one of the few welding procedure which generates fewer amounts of arc rays and fumes. As tongs and linkages are used, welders have to protect themselves for their own safety from the equipments that are kept around. Hence it is advisable to wear safety equipment before performing the welding activity.
When a welder performs spot welding he has to make sure that the current is flowing through the tip of the metals which are going to be joined. This process of welding is unique as you observe that the welded bead is formed inside the surface of base metal. This process of welding is different from a TIG or MIG spot welding.
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.
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.