Showing papers on "Shielded metal arc welding published in 1972"

Self-shielding cored wire to weld cast iron

Abstract: A cored wire welding electrode for welding cast iron having an outer sheath made of nickel or a nickel-iron alloy and a powdered core composition containing copresent metallic magnesium and graphite and slag-forming and alloying ingredients. The electrode is particularly useful for open-arc welding of cast iron to itself and to compatible metals.

Manufacture of electrical metallic tubing

Abstract: Electrical metallic tubing is manufactured from galvanized steel strip by forming the strip into tubular shape, welding the edges together and replacing the zinc lost in welding by gas or arc metallizing the weld zone first with aluminum and then with zinc.

Welding material for super low temperature steels

Abstract: This invention provides a welding material for super low temperature steels which comprises not more than 0.2% carbon, 5 - 12% manganese, not more than 30% chromium, 4 - 8% niobium, 22% iron and not more than 1.5% silicon, the balance being substantially nickel, and which can give excellent strength and impact value to the weld zone. In one embodiment, the welding material is an integral body composed of a metal-forming material and a flux of lime or lime-titania in which the metal forming components are within the above range.

Method for heating corrosive gases with arc heater

Abstract: Corrosive gases, such as air, oxygen, carbon monoxide and carbon dioxide, are heated in an electric arc gas heater by passing the gas to be heated through the arc heater and in contact with an electric arc established between the cathode and anode electrodes thereof. At least one electrode contains less than about 0.0005 volume percent of voids of at least 0.019 inch in any dimension in the area of the electrode eroded by arc operation. Ultrasonic testing is used to determine the void content of the electrodes.

Magnetic control of gas tungsten-arc welding process

Abstract: The possibility of increasing the welding speed in the gas tungsten-arc welding process by using external magnetic fields was investigated. The effects of a constant, transverse magnetic field applied to the arc were studied. Nine percent nickel steel and aluminum alloys types 2021, 6061 and 5454 were the materials used for this investigation. Type 4043 aluminum was used as a filler wire for aluminum and Inconel 625 for the 9% Ni steel weld specimens. Most of the welds were made without the addition of filler metal. All the weld specimens were of bead on plate type. By applying transverse magnetic fields, the maximum welding speed at which undercut-free welds could be obtained was increased considerably. The 9% Ni steel responded exceptionally well to the applied magnetic fields. The magnetic field strength required to produce a satisfactory bead appearance varied with current and travel speed. The arc deflection is consistent with the motor rule. It is suggested that the electromagnetic pumping action of the interacting self and applied magnetic fields produces an improvement in bead appearance.

Device for the manufacture of welded steel pipe from steel of any grade

Abstract: A device for welding of soft steel pipe by resistance welding and of high-alloyed steel pipe by arc welding. It consists of two ways, one for each type of welding, which are synchronized to the machines for the preparation of the steel band and its shaping into a split tube. Because arc welding proceeds at considerably lower speed than resistance welding, a plurality of welders are provided together with means for assigning each split pipe length to one such arc welder. The combination of two different welding ways enables manufacture of seamed pipe from any grade of steel, a reduction of bulged-out end waste, perfect deburring of the seam and savings in time when changing dimensions, using high-alloyed steel.

Electrode for arc welding

Abstract: An electrode for arc welding, comprising a core based on iron with alloying additives of chromium, nickel and titanium, and a coating consisting of fluorite, rutile concentrate, iron powder, chromium and mica. In addition to the above components, said coating also contains magnesite, ferrotitanium and ferroniobium that ensure high plasticity and resilience to the deposited metal, the latter thus being resistant to the formation of pores and hot cracks.

Fixed-dam, vertical-up, open-arc welding

Abstract: A method of vertical-up welding using fixed dams to hold the molten metal in position until hardened wherein the electrode is fed to the weld pool through an electrically energized consumable nozzle positioned in the well formed by the dams and the edges to be welded. The electrode is of the cored type containing the arc shielding and slagging materials on the inside. The amount of slagging material is so limited as to insure an open arc. The arc current, the arc voltage, the electrode diameter and the spacing between the edges to be welded are all so interrelated that the total heat input to the weld is between 300,000 and 650,000 Joules per linear inch of weld per inch of plate thickness for the smaller plate thicknesses and a fixed electrode and up to 750,000 Joules for thicker plate thicknesses and an oscillating electrode. Very high lineal weld speeds result with sound weld beads.

One-side welding process

Abstract: A single-side welding process is facilitated by the use of a flux material which is held against the back of the workpieces to be joined by a copper backing strip. At least 40 percent by weight of the flux is in particulate form having a particle size of less than 840 Mu . The flux also contains a binder material which is fusible under the influence of the arc heat.