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JPH0341908Y2 |
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JPH0356831B2 |
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JPH03193279A |
PURPOSE: To fix the welding efficiency and to improve the welding quality of a resistance welded steel tube by measuring the welding current and voltage close to welding, operating impedance at the time of welding to obtain the welding e...
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JPH03165975A |
PURPOSE: To stably manufacture a resistance welded tube with a sound welded zone by arranging plural metallic rolls having cooling mechanisms on the insides freely rotatably in a contact state on the periphery of a welding upper roll. CO...
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JPH03161178A |
PURPOSE: To work groove lines without generating a chip by press-working the discontinuous groove lines zigzag all over the surface of one side of a sheet metal so that the ends thereof overlap each other and then, working the sheet meta...
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JPH03155479A |
PURPOSE: To maintain weld zone quality at a high level by picking up an image of a bead shape of a weld zone cross section to obtain a shape parameter, correction-calculating a target value of the peak temperature or heating width by the...
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JPH03151176A |
PURPOSE: To improve durability and reduce the manufacturing cost and manufacturing man-hours by making an inner pipe of a shielding box consisting of the inner pipe having many gas nozzles and an outer pipe having plural gas supply ports...
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JPH0341269B2 |
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JPH0340671B2 |
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JPH0340669B2 |
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JPH0340672B2 |
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JPH0340673B2 |
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JPH0340668B2 |
An apparatus for continuous production of seam-welded steel tubing is proposed. The apparatus includes a series of shaping rolls for shaping a strip taken out from a strip coil into a tubular intermediate product, the roll series includi...
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JPH0340670B2 |
A process of continuous production of seam-welded steel tubing is concerned. A steel strip is taken out from a strip coil and conveyed to a tube-preshaping step including a plural of shaping roll stand positions. In the preshaping step, ...
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JPH0334430B2 |
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JPH0334431B2 |
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JPH0334432B2 |
PCT No. PCT/JP85/00674 Sec. 371 Date Aug. 6, 1986 Sec. 102(e) Date Aug. 6, 1986 PCT Filed Dec. 6, 1985 PCT Pub. No. WO86/03443 PCT Pub. Date Jun. 19, 1986.Variations of the output frequency (f(i)) of a high frequency power source (1) for...
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JPH0333071B2 |
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JPH0318064Y2 |
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JPH0336311U |
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JPH0382738A |
PURPOSE: To obtain the resistance welded tube having excellent tube reduction workability in which tube-warping is reduced and the generation of cracks is prevented in tube reduction working by subjecting a cold rolled steel sheet obtd. ...
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JPH0324313B2 |
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JPH0360878A |
PURPOSE: To prevent the lowering of the product appearance and the workability of the electric welded stainless steel pipe by producing the electric welded steel pipe in at least two stages; a stage for lightly cutting the beads on the o...
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JPH0319286B2 |
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JPH039904Y2 |
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JPH039903Y2 |
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JPH0357572A |
PURPOSE: To reduce the power cost and to extend the service life of a roll by constituting at least a fin plate and a roll body part being in the vicinity of the fin plate, of a non-conductive material, in the upper roll of a seam guide ...
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JPH0352780A |
PURPOSE: To obtain perfectly surface finished circular bands by forming continuous pipes from a roll of a sheet metal by shaping by rollers and high-frequency welding, cutting these pipes to cylindrical segments and rolling these segment...
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JPH0318909U |
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JPH0335812A |
PURPOSE: To prevent generation of stepped flaw on a pipe part corresponding to the concave arcked part of a roll by forming a linear relief part between a concave arcked part and a convex arcked part on a squeeze roll. CONSTITUTION: When...
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JPH0327882A |
PURPOSE: To monitor the shape of a weld zone by constituting the subject monitor so that an irradiation light from a light source irradiates the weld zone and is reflected, this reflected light transmits through a filter and is detected ...
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JPH0327881A |
PURPOSE: To fix a reference temperature within a prescribed range and to improve the accuracy of a welding input by determined in advance a temperature measuring position in which it is predicted that a weld zone temperature enters withi...
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JPH037474B2 |
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JPH037473B2 |
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JPH0323085A |
PURPOSE: To surely detect defect in cold joint part during welding with high reliability by detecting time series occurrence frequency when rate of variation of high-frequency oscillating frequency for high-frequency seam welding becomes...
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JPH0323084A |
PURPOSE: To prevent variation of welding temp. and to easily obtain a seam welded pipe having stable quality in welded part by arranging a cylindrical heat resistant resin body having the prescribed cross sectional area through elastic b...
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JPH0318486A |
PURPOSE: To prevent welding defects by comparing and computing the signal detected by a flow detector with a normal value by a computing device, feeding the result of the computation to the controller of a welding device, and then weldin...
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JPH034316B2 |
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JPH0313278A |
PURPOSE: To prevent the infiltration of the atm. air into shielding boxes and to improve a working rate by forming the shielding box into duplex pipe structure and allowing the shielding gas ejecting from the gas ejection ports provided ...
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JPH034387U |
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JPH035084A |
PURPOSE: To accurately monitor a welding state by measuring a shape and a temperature distribution of a seam edge weld zone, taking in coordinates of the welding central point, then, starting welding and processing an obtained temperatur...
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JPH03483A |
PURPOSE: To reduce the occurrence of hydrogen induced cracking or sulfide stress cracking by providing a covering layer of a metallic sulfide on a welding seam part of the tube interior side at least. CONSTITUTION: The covering layer 3 o...
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JPH02307686A |
PURPOSE: To improve the product quality by suppressing an appearance failure by bringing edge parts of both side end parts of a stainless steel plate to rolling reduction to a tapered shape before roll forming, at the time of manufacturi...
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JPH02299782A |
PURPOSE: To suppress the quantity of a bead discharged and to improve machinability of the bead and to improve working efficiency by heating both side edge parts of an open pipe up to the temperature above the Curie point by a first heat...
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JPH02299783A |
PURPOSE: To prevent the occurrence of weld defects and flashes by impressing a current of specific frequency on an open pipe to preheating it before melting the open pipe and then, heating it up to the melting point to perform butt weldi...
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JPH02295681A |
PURPOSE: To continuously and completely eliminate bead width variation by obtaining a cross-correlation function on the product of the depressing force of a roll and the bead width from variation of both and regulating the roll pressing ...
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JPH0244950Y2 |
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JPH0255151B2 |
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JPH02138084U |
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JPH02138085U |
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