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Showing papers on "Spot welding published in 1976"


Patent
24 Mar 1976
TL;DR: In this article, a method and apparatus for testing the integrity of spot welds made by a welding machine without destroying the manufactured parts being produced is presented, which includes welding together a pair of angle members made from the same sheet material as the parts being manufactured to form a "T-shaped" test specimen.
Abstract: A method and apparatus for testing the integrity of spot welds made by a welding machine without destroying the manufactured parts being produced, said method and apparatus including welding together a pair of angle members made from the same sheet material as the parts being manufactured to form a "T-shaped" test specimen with the outwardly extending cross arm of this "T" forming attachment portions and providing a testing tool constructed and arranged to pull apart the welded together portions of the angles and test the integrity of the weld with a minimum of force being applied thereto.

14 citations


Patent
10 Nov 1976
TL;DR: In this paper, the quality of joints formed by spot welding, particularly the diameters of the individual nuggets, can accurately and nondestructively be inspected by heating or cooling one of the welded members and measuring the distribution of the surface temperature of the other member because of a maximal heat conduction at each nugget.
Abstract: The quality of joints formed by spot welding, particularly the diameters of the individual nuggets, can accurately and nondestructively be inspected by heating or cooling one of the welded members and measuring the distribution of the surface temperature of the other member because of a maximal heat conduction at each nugget. The surface temperature distribution may be measured merely linearly since the width of a peak on the temperature-distance curve depends on the diameter of a nugget.

14 citations


Proceedings ArticleDOI
01 Feb 1976

8 citations


Patent
25 Nov 1976
TL;DR: In this paper, the collector has a flat plate with a highly absorbing face on the outer side and a back plate which is pressed to have horizontal channels at top and bottom linked by a large number of vertical channels.
Abstract: The collector has a flat plate with a highly absorbing face on the outer side. It has a back plate which pressed to have horizontal channels (6, 4) at top and bottom linked by a large number of vertical channels (8). This plate is placed on the back of the flat plate and the two are joined together by contact welding (3) so that the channels are closed to form flow and return headers joined by vertical passages. The joining is completed by spot welds (10) between the channels. Nipples (7) to enable the headers to be joined to flow and return pipes are pushed into the ends of the headers. The collector is insulated on the back and placed inside a double sided glass enclosure.

7 citations



Patent
30 Dec 1976
TL;DR: In this paper, a resistance welding ring is equipped with a computer as the desired value setter which receives signals from sensors which represent the duration and the total energy of a spot weld and the number of the half-waves already counted during a weld.
Abstract: A resistance welding ring is equipped with a computer as the desired value setter which receives signals from sensors which represent the duration and the total energy of a spot weld and the number of the half-waves already counted during a weld. The computer shapes the energy input for a weld as a function of time in accordance with a flat-lying S-shaped curve which represents the resistance change of a welding spot as a function of the time. This eliminates the defective spot welds which may still occur if the controller keeps the energy input constant for the entire duration of a weld.

5 citations



Patent
09 Dec 1976
TL;DR: An electrical resistance welding apparatus for spot welding workpieces together is comprised of a mounting on which two anvil blocks are supported for displacement relative to one another in order to engage and clamp a workpiece to the mounting in preparation for welding as mentioned in this paper.
Abstract: An electrical resistance welding apparatus for spot welding workpieces together is comprised of a mounting on which two anvil blocks are supported for displacement relative to one another in order to engage and clamp a workpiece to the mounting in preparation for welding. At least one of the blocks which engages a workpiece is also electrically conductive to serve as one welding electrode in the spot welding process. A secondary electrode positioned in the vicinity of the electrically conductive anvil block clamps a second workpiece against the first on the mounting for spot welding. The mounting is electrically conductive and is electrically connected with the conductive anvil block for transmitting welding current from an electrical power source.

4 citations


Patent
22 Jul 1976
TL;DR: In this paper, the bottom ends of the two lever are attached to two piston rods, one piston rod being mounted in each end of a hydraulic cylinder used to actuate both levers; and the upper ends of both lever are fitted with a pair of rollers employed to align the workpieces.
Abstract: Aligning fixture for the pre-welding, i.e. spot or tack welding, of cylindrical workpieces prior to the actual welding process, comprises a base-plate fitted with two supports, each support carrying a lever on a pivot and the two levers swivel in the same plane. The bottom ends of the two levers are attached to two piston rods, one piston rod being mounted in each end of a hydraulic cylinder used to actuate both levers; and the upper ends of both levers are fitted with a pair of rollers employed to align the workpieces.

3 citations


Patent
08 Dec 1976

3 citations


Patent
08 Apr 1976
TL;DR: In this paper, a process for joining two or more shaped metal parts, using a sealant between all the joint surfaces, the sealant contains individual round grins of metal, or another material, with a controlled grain-size, and the two metal parts being joined are brought together leaving a gap determined by the preselected grain size.
Abstract: In a process for joining two or more shaped metal parts, using a sealant between all the joint surfaces, the sealant contains individual round grins of metal, or another material, with a controlled grain-size, and the two metal parts being joined are brought together leaving a gap determined by the preselected grain-size; the parts are then joined by, or via the sealant. The grains are pref. chosen from an alloy which is compatible with the metal parts being joined, and grains of different sizes and different metals can be used to form alloys inside the welded seam. The sealant may be an elastic adhesive, applied dry, and its binding or sealing functions obtd. by a hardening process; it may include an open-weave textile or perforated material. Process combines new sealants, a welding operation and/or heat-hardening, e.g. the sealant may be partly hardened by heat created during a spot-welding operation and hardening then completed during a subsequent process such as the heat-hardening of the paint on motor-cars.


Patent
12 Aug 1976
TL;DR: In this paper, the authors present a non-destructive inspection and control of welded joints where electrode movement occurs during welding, i.e., in spot-or projection welding, where the electrode movement is measured and a defect indicated if the electrode movements are below a prescribed min. value.
Abstract: Process for the non-destructive inspection and control of welded joints where electrode movement occurs during welding, esp. in spot- or projection welding in which the electrode movement is measured an a defect indicated if the electrode movement is below a prescribed min. value. A defect is pref. also detected if the electrode movement exceeds a prescribed max. value. In the pref. welding plant, the presence of a defect results in the clamping of the workpiece so that it cannot be removed until a release signal is applied. Immediate indication of faulty welds while the workpiece is on the welding plant is obtd.

Patent
24 Nov 1976
TL;DR: In this paper, the head value of ultrasonic reflected wave was detected and compared with a set value during the weld process to provide a device of enabling quantitative determination of welded state at weld process.
Abstract: PURPOSE:To provide a device of enabling quantitative determination of welded state at weld process by detecting the head value of ultrasonic reflected wave and comparing it with a set value during weld process.

Patent
19 Feb 1976
TL;DR: In this article, a system for the production of pipes from copper sheet, in partic. for the manufacture of pipe sections with curved axes such as run out pipes for rainwater guttering or outlet pipes of thin walled copper sheet was presented.
Abstract: A system for the production of pipes from copper sheet, in partic. for the manufacture of pipe sections with curved axes such as run out pipes for rainwater guttering or outlet pipes of thin walled copper sheet, has the pipes made by application of resistance overlapping seam welding with the use of pressure electrodes pressed against the material to be welded before and after the welding process. Electrodes which do not adhere to the copper sheet during welding, in patic. molybdenum electrodes are used for the welding process. Continuous spot welding with overlapping weld beads directly bounding one another is used.

Patent
23 Dec 1976
TL;DR: In this paper, a capacitor-discharge pulse welding machine is used for welding plain surfaces of two metal parts together where the plain surfaces are surrounded by intermediate dielectric layers forming an air tight welding cavity provided with an opening permitting a vacuum to be applied.
Abstract: Process for mfg. capacitors using dielectrics which are protected from breakdown. The novelty is the use of a capacitor field onto which >=1 additional field is superimposed so a prescribed part of the lines of force is deflected in another direction and the electrostatic pressure on the dielectric is therefore altered by a prescribed amt. The process is pref. employed for welding the plain surfaces of two metal parts together where the plain surfaces are surrounded by intermediate dielectric layers forming an air tight welding cavity pref. provided with an opening permitting a vacuum to be applied. Pref. vacuum welding devices are included in 30 claims. Used for welding two metal sheets together using a capacitor-discharge pulse welding machine, where the invention permits a redn. in voltage and prevents premature discharge.

Patent
19 Feb 1976
TL;DR: In this article, an optimum build-up curve (the desired curve) is obtd. using a battery to charge a capacitor (I), the voltage across (I) being used as a measure of the power desired; simultaneously, the actual power used is monitored electronically and fed to a second capacitor (II); the voltages on (I and (II) are compared in a differential amplifier which emits a voltage driving a controllable resistance, pref.
Abstract: Process is for controlling spot welding machines w.r.t. both time and power output. An optimum build-up curve (the desired curve) is obtd. using a battery to charge a capacitor (I), the voltage across (I) being used as a measure of the power desired; simultaneously, the actual power used is monitored electronically and fed to a second capacitor (II); the voltages on (I) and (II) are compared in a differential amplifier which emits a corresp. voltage driving a controllable resistance, pref. a power transistor, which then controls the phase of the welding machine so the voltage on the capacitor providing the spot welding power matches that on the optimum build-up curve at any moment, and a Schmitt trigger helps to cut off the power when the zero pause on the 50 Hz A.C. mains supply is reached. Irrespective of the large differences which occur in the resistance of the junctions between the welding electrodes and the workpieces, a prescribed amt. of power is delivered.