Spot welding is a resistance welding method used to join two to Three overlapping metal sheets which are up to 3 mm thick each. In some applications with only two overlapping metal sheets, the sheet thickness can be up to 6 mm. Two copper electrodes are simultaneously used to clamp the metal sheets together and to pass current through the sheets. When the current is passed through the electrodes to the sheets, heat is generated due to the higher electrical resistance where the surfaces contact each other.
As the heat dissipates into the work, the rising temperature causes a rising resistance, and the heat is then generated by the current through this resistance. The surface resistance lowers quickly, and the heat is soon generated only by the materials’ resistance. The water cooled copper electrodes remove the surface heat quickly, since copper is an excellent conductor. The heat in the center has nowhere to go, as the metal of the work piece is a poor conductor of heat by comparison.
The heat remains in the center, melting the metal from the center outward. As the heat dissipates throughout the work piece in less than a second the molten, or at least plastic, state grows to meet the welding tips. When the current is stopped the copper tips cool the spot weld, causing the metal to solidify under pressure. Some coatings, such as zinc, cause localized heating due to its high resistance, and may require pulsation welding to dissipate the unwanted surface heat into the copper tips.
If excessive heat is applied, or applied too quickly, the molten area may extend to the outside, and with its high pressure (typically 30,000 psi) will escape the containment force of the tips with a burst of molten metal called expulsion. When this occurs, the metal will be thinner and have less strength than a weld with no expulsion.
The common method of checking a weld is a peel test, technically called “coach peel”, as expulsion weakens the material by thinning, and makes it pass the peel test easier. A better test is the tensile test, which is much more difficult to perform, and requires calibrated equipment.
The advantages of the method include efficient energy use, limited work piece deformation, high production rates, easy automation, and no required filler materials. When high strength in shear is needed, spot welding is used in preference to more costly mechanical fastening, such as riveting.
While the shear strength of each weld is high, the fact that the weld spots do not form a continuous seam means that the overall strength is often significantly lower than with other welding methods, limiting the usefulness of the process. It is used extensively in the automotive industry— cars can have several thousand spot welds. A specialized process, called shot welding, can be used to spot weld stainless steel.
There are three basic types of resistance welding bonds: solid state, fusion, and reflow braze. In a solid state bond, also called a thermo-compression bond, dissimilar materials with dissimilar grain structure, e.g. molybdenum to tungsten, are joined using a very short heating time, high weld energy, and high force.
There is little melting and minimum grain growth, but a definite bond and grain interface. Thus the materials actually bond while still in the “solid state”. The bonded materials typically exhibit excellent shear and tensile strength, but poor peel strength. In a fusion bond, either similar or dissimilar materials with similar grain structures are heated to the melting point (liquid state) of both.
The subsequent cooling and combination of the materials forms a “nugget” alloy of the two materials with larger grain growth. Typically, high weld energies at either short or long weld times, depending on physical characteristics, are used to produce fusion bonds. The bonded materials usually exhibit excellent tensile, peel and shear strengths. In a reflow braze bond, a resistance heating of a low temperature brazing material, such as gold or solder, is used to join either dissimilar materials or widely varied thick/thin material combinations.
The brazing material must “wet” to each part and possess a lower melting point than the two work pieces. The resultant bond has definite interfaces with minimum grain growth. Typically the process requires a longer (2 to 100 ms) heating time at low weld energy. The resultant bond exhibits excellent tensile strength, but poor peel and shear strength.
Like spot welding, seam welding relies on two electrodes to apply pressure and current to join metal sheets. However, instead of pointed electrodes, wheel-shaped electrodes roll along and often feed the work piece, making it possible to make long continuous welds. In the past, this process was used in the manufacture of beverage cans, but now its uses are more limited.
Seam welding is the act of welding two similar metals together at a seam, usually on a piece of automated equipment. This process differs from butt welding, as that is generally a process that is done on static (non-moving) metals.
Seam welding consists of two (or more) moving metals through forming production equipment. A common use of seam welding is for copper and steel piping for construction. Varying the amperage as well as speeds of the moving metals ensure a proper seam weld, and many industries use this process for creation of finished goods.
Resistance seam welding is a resistance welding process that produces a weld at the faying surfaces of overlapped parts along a length of a joint. The weld may be made by overlapping weld nuggets, a continuous weld nugget or by forging the joint as it is heated to the welding temperature by resistance to the flow of welding current.
Instead of using two cylindrical electrodes as in case of spot welding, here two circular disks are used as electrodes. The work piece is passed through the space between the two discs, and under pressure applied by the discs and current flowing through them, a continuous weld is formed.
With seam welding the material passes between two rotating wheels or welding rollers. The welding rollers perform three tasks:
Weld current transmission
Feed motion transmission
The high electrical A/C current (low voltage) is supplied from a transformer.
The overlap of the work piece with its comparatively high electrical resistance is intensely heated by the current. With each positive or negative current half-wave the parts are heated to a semi-molten condition, especially at the current peaks.
The semi-molten overlap surfaces are pressed together by the welding pressure which causes them to bond together into a uniforming welded structure after cooling. Most seam welded technologies use water cooling through the weld roller assemblies due to the intense heat generated.
Seam welding is mainly used on the seams of tubes and pipes for its ease and accuracy. The resulting weld from the welding wheels is extremely durable due to the length of the contact area.
Ultrasonic seam welders use energy at a frequency around 20 kHz to vibrate the material being worked on. The vibration creates friction, the friction creates heat, causing the material to melt together. Ultrasonic welding is the process used to create the plastic packages that are extremely hard to open without destroying the package
Last Updated on Friday, 10 August 2012 00:58