Showing papers on "Butt welding published in 1973"
01 May 1973
TL;DR: FATIGUE TESTS have been CONDUCTED on low-Carbon STEEL BUTT WELDS CONTAINING JOINT PENETRATION DEFECTS (less than complete join penetration) as discussed by the authors.
Abstract: FATIGUE TESTS HAVE BEEN CONDUCTED ON LOW CARBON STEEL BUTT WELDS CONTAINING JOINT PENETRATION DEFECTS (LESS THAN COMPLETE JOINT PENETRATION). THE GROWTH OF FATIGUE CRACKS FROM SIMULATED PENETRATION DEFECTS WAS MONITORED BY RADIOGRAPHY. THESE MEASUREMENTS ALLOWED THE TOTAL FATIGUE LIFE TO BE SEPARATED INTO PERIODS OF CRACK INITIATION AND CRACK PROPAGATION. THE INITIATION PERIOD WAS FOUND TO OCCUPY APPROXIMATELY ONE-HALF OF THE TOTAL FATIGUE LIFE AND CONSISTS OF THE CYCLES NECESSARY TO SHAKE DOWN THE RESIDUAL STRESSES IN THE WELD AND TO FORM THE PENETRATION DEFECT INTO AN ACTIVE FATIGUE CRACK. /AUTHOR/
19 citations
Patent•
05 Feb 1973TL;DR: In this article, an automatic circumferentially traveling mechanism for use in an automated circumferential welding or cutting device which is adapted to automatically weld or cut a cylindrical body along a line thereof is described.
Abstract: This disclosure relates to an automatic circumferentially traveling mechanism for use in an automatic circumferential welding or cutting device which is adapted to automatically weld or cut a cylindrical body along a circumferential line thereof. The combination of a welding or cutting device provided with magnetic rollers and flexible bodies which are adapted to guide the body of the welding or cutting device make easier the automatic welding or cutting operation, which has heretofore been of a time-consuming nature, and provides the achievement of such with a mechanism which is light in weight and well suited for such an operation.
17 citations
Patent•
27 Jun 1973TL;DR: In this paper, a soft metal sheath is constructed from a metal tape of aluminum or copper through the working stages of applying a cylindrical tube shaped from the tape onto a cable core, butt welding the seam, and then reducing the diameter of the metal tube to connect it to the core.
Abstract: Manufacturing of a soft metal sheath formed of aluminum or copper, for example, is improved by suitably selecting the apparatus composing the shaping means employed therein and arranging the capstan and the sinking die in a novel manner. The apparatus selected is made from a wear-resistant synthetic resin such as a molybdenum bisulfide-included nylon. The sheath is manufactured from a metal tape of aluminum or copper through the working stages of applying a cylindrical tube shaped from the tape onto a cable core, butt welding the seam, and then reducing the diameter of the metal tube to connect it to the core.
16 citations
Patent•
07 Jun 1973
TL;DR: In this article, the ends of two pipes or rods to be butt welded are beveled to form a V-shaped groove when abutting opening toward the outer periphery, a ring of metal of corresponding size and V-shape configuration to the groove is positioned within the groove and the ring is forcibly rotated about the axis of the pipe or rod, while compressing the pipes and rods together.
Abstract: The ends of two pipes or rods to be butt welded are beveled to form a V-shaped groove when abutting opening toward the outer periphery, a ring of metal of corresponding size and V-shaped configuration to the groove is positioned within the groove and the ring is forcibly rotated about the axis of the pipe or rod, while compressing the pipes or rods together. The heat of friction fully plasticizes the ends of the pipes or rods and the ring, rotation of the ring ceases and final compression between the pipes effects welding. Alternatively, the ends of the pipes are at right angles to the pipe axis and the ring comprises a short section of pipe corresponding to the two pipes to be butt welded.
13 citations
Patent•
08 Jun 1973
TL;DR: In this paper, a finned sleeve is used as a heat sink for welding the conductors and becomes permanently welded to them in high-voltage cables with aluminum conductors.
Abstract: In a joint in high-voltage cables with aluminum conductors a finned sleeve serves as a heat sink for butt welding the conductors and becomes permanently welded to them. The sleeve has a radial projection that makes electrical contact with an electrostatic shield embedded in a thick-walled dielectric cylinder surrounding the weldment.
7 citations
Patent•
29 Jun 1973
TL;DR: In this article, a Butt Welded tube is provided having excellent properties by the steps of forming a skelp onto a round shape, butt welding the edges thereof with butt welding rolls, blowing oxygen or air into the weld zone, so that said zone is brought to a melted condition with oxidizing heat based on blowing and some notches which are formed are blown off with said blowing, and then said tube is passed through a train of reducing rolls to obtain a smooth surface and the required dimension of said tube.
Abstract: A butt welded tube is provided having excellent properties by the steps of forming a skelp onto a round shape, butt welding the edges thereof with butt welding rolls, blowing oxygen or air into the weld zone, so that said zone is brought to a melted condition with oxidizing heat based on said blowing and some notches which are formed are blown off with said blowing, and then said tube is passed through a train of reducing rolls to obtain a smooth surface and the required dimension of said tube.
6 citations
Patent•
08 Mar 1973
TL;DR: In this paper, the two rope ends were each held by a clamping device and in the weld area the rope ends are enclosed in a single or multi part ceramic tube, which is held separately in a holder so that it is held rigidly during the welding operation.
Abstract: For the butt welding operation the two rope ends are each held by a clamping device and in the weld area the rope ends are enclosed in a single or multi part ceramic tube, which is held separately in a holder so that it is held rigidly during the welding operation. The method ensures good alignment of the ropes and is particularly useful for thick ropes.
5 citations
01 Jan 1973
TL;DR: In this paper, a single pass, butt welding conditions were determined using visual, radiographic, ultrasonic and metallographic inspection, across weld hardness surveys and tensile tests.
Abstract: Welding trials have been carried out on 2 in thick Ti-6A1-4V bar using a 60kV 15kW Sciaky electron beam welding machine. Optimum single pass, butt welding conditions were determined using visual, radiographic, ultrasonic and metallographic inspection, across weld hardness surveys and tensile tests. Narrow, full penetration welds with almost parallel cross sections were produced. A stress relieving treatment for the joints was determined from the results of stress relaxation tests on weld metal and on parent metal.
5 citations
Patent•
20 Apr 1973TL;DR: In this article, a simple control of the melting rate of welding wire is achieved by supplying the motor driving the drive rollers for the consumable welding wire with a voltage drived from an extra secondary winding coupled to the first secondary windings of a multiphase welding transformer, which via rectifiers supply the welding direct current.
Abstract: Very simple control of the melting rate of welding wire is achieved by supplying the motor driving the drive rollers for the consumable welding wire with a voltage drived from an extra secondary winding coupled to the first secondary windings of a multiphase welding transformer, which via rectifiers supply the welding direct current. This extra winding ensures the better coupling to the secondary welding windings by employing the stray flux. By combinations of taps on the windings via a multiple switch, welding characteristics can be obtained and each characteristic has a stable point to which the control system adjusts itself.
4 citations
Patent•
07 Feb 1973TL;DR: In this article, an elongated bar is welded to one end of a tube by friction or inertia welding, and then the bar is cut a predetermined distance from the point of attachment to the tube to form a cap.
Abstract: The method welding of tubes to a tube sheet comprises butt welding an elongated bar to one end of a tube to be welded so that the bar is in substantial axial alignment with the tube and, thereafter, welding the opposite end of the tube to a tube sheet by friction or inertia welding using the bar to at least partially support the tube for movement relative to the tube sheet. After the tube is welded to the tube sheet, the bar is cut a predetermined distance from the point of attachment of the bar to the tube to form a cap, if desired. The bar then may be worked to provide the cap with a desired configuration.
4 citations
Patent•
15 Mar 1973
TL;DR: An electrode head for chain links welding was proposed in this paper, in which means are provided for simultaneously moving a pair of gripping arms through a compound moment relative to a chain-link being welded.
Abstract: An electrode-head for chain links welding apparatus in which means are provided for simultaneously moving a pair of gripping arms through a compound moment relative to a chain-link being welded whereby minimum wear on the welding apparatus electrodes occurs and maximum contact and welding current is provided at the links being welded.
Patent•
27 Jul 1973TL;DR: In this article, a method of welding vertically arranged metallic members together by butt welding is described, which consists of forming between the metallic members a groove defined by parallel groove faces and extending obliquely upwardly from the back side to the front side of said metallic members at a suitable angle of inclination to said members, attaching a backing strip to the back-side opening of said groove and thereafter forming beads in said groove successively from the lower end to the upper end thereof by arc welding.
Abstract: A method of welding vertically arranged metallic members together by butt welding, comprising forming between the metallic members a groove defined by parallel groove faces and extending obliquely upwardly from the back side to the front side of said metallic members at a suitable angle of inclination to said metallic members, attaching a backing strip to the back side opening of said groove and thereafter forming beads in said groove successively from the lower end to the upper end thereof by arc welding thereby to weld said metallic members together.
Patent•
22 May 1973
TL;DR: In this article, a welding crater fill mechanism is provided with means for positioning welding guns in position for welding between weldment component moving relative to the welding guns, and means to determine the length of the weld between the weldment components so that when such length of weld has been completed, additional means move the welding gun so that the welding arms overlap at least a portion of the welding.
Abstract: A welding crater fill mechanism is provided with means for positioning welding guns in position for welding between weldment component moving relative to the welding guns, and means to determine the length of the weld between the weldment components so that when such length of weld has been completed, additional means move the welding guns so that the welding guns overlap at least a portion of the weld. Additional means are provided for accommodating movement of the welding guns horizontally and toward and away from the weldment components as well as means to actuate such movement and means are provided for turning the welding guns on to initiate the welding and to stop the welding. The mechanism includes an arrangement so that after the overlap has been completed the welding guns are withdrawn from the weldments as the welding guns are turned off; similarly, the welding guns are initially positioned adjacent the weldment components prior to turning the welding gun on.
Patent•
01 Mar 1973
TL;DR: In this article, a conveyor transports tubes and a dresser upstream of the welder removes external burr and a separate dresser removes internal burr, and inclined guides present the tubes to the conveyor and are disposed perpendicular to its axis upstream of an external Burr dresser.
Abstract: A conveyor transports tubes and a dresser upstream of the welder removes external burr and a separate dresser removes internal burr. Inclined guides present the tubes to the conveyor and are disposed perpendicular to its axis upstream of the external burr dresser. The servicing tool of the internal burr dresser is disposed between the welder straps and is connected by a hollow rod and a shaft to drives on a carriage fixed to the conveyor behind the welder.
Patent•
03 May 1973
TL;DR: In this paper, a defective section is removed in an angled cross-section cut of about 90 degrees and a prepd. replacement in serted with a yoke, angled heater and pressure unit.
Abstract: Defective section is removed in an angled cross-section cut of about 90 degrees and a prepd. replacement in serted with a yoke, angled heater and pressure unit. The replacement, with the softened edges, is pushed intng the piping while laid into the ground without the need to cut screw and thread connections.
Patent•
30 May 1973
TL;DR: A resistant butt welding machine has fixed (I) & mobile (II) vices holding the workpieces, a slide valve servo distributor (III) driving (II), and automatic sparking speed (IV), delivery start (V) and delivery rate (VI) commands each with its own executive mechanism.
Abstract: A resistant butt welding machine has fixed (I) & mobile (II) vices holding the workpieces, a slide valve servo distributor (III) driving (II) and automatic sparking speed (IV), delivery start (V) and delivery rate (VI) commands each with its own executive mechanism. The executive mechanisms form a single unit rigidly fixed to (II) and comprising a rod (VII) with two longitudinal movement actuators and a stop with an actuator. One rod actuator is connected to the output of (IV) and the other to the output of (VI). (I) is rigidly assembled with (III) whose slide valve is kinematically connected to (VII).
Patent•
09 Aug 1973
TL;DR: In this article, a pattern of slits which run parallel to the line of the seam is used to roll polyethylene foam sheeting for storage, the slits allowing it to stretch over the item.
Abstract: Polyethylene foam sheeting is prefd. as the seaming of the tube can be effected by heat giving a butt weld. The rolled foam sheet is then pressed flat and perforated in a pattern of slits which run parallel to the line of the seam to be rolled for storage. The prepd. m aterial can be cut into lengths and passed over the item to be packed and protected, the slits allowing it to stretch over the item.
01 Jan 1973
TL;DR: In this article, the application of titanium construction to replace existing aluminium alloy structure using the same design loadings, applying the same structural philosophies, and accepting the same practical constraints on geometry was examined.
Abstract: The purpose of certain design studies was to examine the application of titanium construction to replace existing aluminium alloy structure using the same design loadings, applying the same structural philosophies, and accepting the same practical constraints on geometry. Under these design conditions weight savings result from the relative specific material properties of titanium alloys and aluminium alloy, the reduction in sizes permissible in titanium and, also from the exploitation of the weldability of titanium to produce more efficient configurations. Ti 8A1, 1Mo, 1V was specified (Duplex Annealed). The relatively thin fuselage skin (0.022 in.) was expected to be sufficiently free from stress corrosion hazards under aqueous conditions. Three particular areas were chosen for evaluation, viz., the sheet/stringer/frame structure in the keel area, the upper fuselage, and a window panel area. The usual attention was given to fatigue strength, critical crack length, and residual strength. Fusion welding was used whenever practicable, i.e., for skin to stringer joints and panel butt welds, with a little electrical resistance spot welding for the frame to fuselage skin attachment. The weight savings possible with the titanium design as compared with the aluminium structure were as follows:
Fuselage keel area – 26.3%
Upper fuselage area – 17.6%
Window panel area – 28.0%
The overall weight saving on the complete fuselage section was 23.6%.
01 Jan 1973
TL;DR: In a previous paper as discussed by the authors, we presented the results of some work on the tensile and fatigue properties of a range of titanium alloys in 0.7mm and 1.6mm.
Abstract: In a previous paper (1) the authors presented the results of some work on the tensile and fatigue properties of a range of titanium alloys. On that occasion the discussion of the fatigue properties was limited to consideration of the 1.6mm. parent sheet and butt welds, made by the TIG process. Work was, however, in progress on two of the alloys, Ti-6A1-4V(A) and Ti-8A1-1Mo-1V (L), in 0.7mm. sheet. The programme was complementary to that described in reference (1), but for one of the alloys, Ti-6A1-4V, included tests on penetration T joints which were an attempt to simulate a possible form of skin and stringer construction for aircraft.