In a method for controlling pulse arc welding where an arc is created between a wire and a base material, a pulse waveform different from the pulse waveform for steady-state welding is outputted when a predetermined time has passed since short-circuit welding control was started at arc start, and after a sufficiently large melt pool is formed, the pulse waveform for the steady-state welding is outputted This reduces the generation of spatters after an arc is created and until the arc is stabilized

Arc welding control method

A conductive powder having an organic silicon polymer layer on the surface of each particle and a metal layer enclosing the silicon polymer layer possesses a stronger bond between the particle base and the metal even at elevated temperature and exhibits a high and stable conductivity and heat resistance.

Conductive powder and making process

A welding method capable of increasing or decreasing a welding wire feeding speed during welding, wherein, after short-circuiting is detected, a welding wire feeding speed is decreased, and, after a transfer to arcing by being freed from short-circuiting is detected, a welding wire feeding speed is increased.

Consumable electrode type arc welding method and device therefor

In a pulsed arc welding method of the invention, a shield gas made mainly of carbon dioxide gas is used, and a low frequency pulse of 30 to 100 Hz is continuously generated, on which a high frequency pulse with a pulse frequency of 500 to 2000 Hz is superimposed. In this case, the welding current is determined such that an average peak current IP avg is at 300 to 700 A, an average base time T b is at 5 to 30 ms, a current amplitude IP- a at a peak time of a high frequency pulse is at 50 to 600 A, and a current amplitude IP b at a base time of a high frequency pulse is at 20 to 200 A. This method ensures a reduced degree of biasing of a drop and an arc, for which the size, release time and release direction of a drop are kept substantially completely constant, and can achieve drop transfer wherein regularity of one pulse group-one drop transfer is very high. Hence, spatter and fume generation rates can be remarkably reduced.

Pulsed arc welding method

A polyester resin composition containing a thermoplastic polyester resin; a polyester copolymer containing a monomer having at least one of an amino group, an imino group, an amido group, and a sulfonic acid group; a layered silicate; and an antioxidant The monomer having at least one of an amino group, an imino group, an amido group, and a sulfonic acid group is contained in the polyester copolymer in an amount of 5 to 15 mol % The monomer having at least one of an amino group, an imino group, an amido group, and a sulfonic acid group is contained in the polyester resin composition in an amount of 1 to 5 mol % based on a total polyester content of the polyester resin composition The antioxidant is contained in the polyester resin composition in an amount of 001% to 10% by mass

Polyester resin composition

PROBLEM TO BE SOLVED: To stabilize an arc without inducing an arc unstable phenomenon by a fluctuation in arc length even at such a long wire projecting length at which large globules are formed at the front end of a wire and to execute welding with extremely less generation of spatters at the time of executing AC self-shielded arc welding by using a small-diameter self-shielded welding wire. SOLUTION: The time rate of the positive polarity period in one period of AC is defined as an EN rate, the average value of the positive polarity welding current of the positive polarity period in one period of the AC as Ien and the average value of the reverse polarity welding current in the reverse polarity period as Iep. The EN rate is then set in a range of 30 to 90% and the welding is executed by passing the welding current in such a manner that Iep is smaller than Ien.

Ac self-shielded arc welding method

PURPOSE: A solid wire for welding is provided to reduce load on the environment and to repress the wear of an electricity-supplying chip in welding. CONSTITUTION: Oxide scales(12) with 0.002 to 0.3mg per 100mm square are formed on the surface of a solid wire for welding(11), at least one kind selected from MoS2, WS2, and graphite, of which the particle diameter is 0.1 to 10 micro m, coats over the surface of the wire in the amount of 0.01 or 2g per 10kg of the wire, and plating is not applied. In additional, at least one kind of oil selected from vegetable oil, animal oil and synthesis oil coats over the surface in the amount of 0.2 to 2.0g per 10kg of the wire.

Solid wire for welding

Described is a solid wire for MAG welding which has no copper plating on the wire surface and which has good welding workabilities such as a reduced amount of generated spatters and good arc stability in the MAG welding of steel sheets. A solid wire for MAG welding comprises, as chemical components for the wire, 0.01 to 0.15 wt % of C, 0.20 to 1.00 wt % of Si, 0.70 to 1.70 wt % of Mn, 0.30 wt % or below of Ti, 0.025 wt % or below of S, 0.020 wt % or below of O, and the balance being Fe and inevitable impurities, wherein said wire is applied on the surface thereof with at least one compound serving as an arc stabilizer and selected from the group consisting of a K compound and a Cs compound in such a way that when an amount of the K compound to be applied to (calculated as K) is taken as Appm relative to the weight of said wire and an amount of the Cs compound (calculated as Cs) is taken as Bppm, a value of (A+3B) is in the range of 2 to 15 ppm. The wire has such a structure as not to be plated with copper on the surface thereof.

Solid wire for mag welding

PROBLEM TO BE SOLVED: To reduce the amt. of spatters to be generated by enabling the smooth short-circuited movement of droplets in the case of welding at a low electric current, preferably, to make excellent rust resistance and wire feedability and to made better the cracking resistance of the weld metal to be obtained. SOLUTION: This solid wire for gas shield arc welding is the one having a compsn. contg., by weight, 0.03 to 0.13% C, 0.2 to 1.1% Si, 0.5 to 1.9% Mn, 0.0005 to 0.025% S and 0.0005 to 0.015% O, in which the content of Ti is regulated to <=0.03% and that of Al to <=0.02%, and the balance Fe with inevitable impurities. Furthermore, the surface of the wire is not applied with copper plating, and MoS#2 of 0.05 to 0.8g per 10kg wire is formed thereon.

Solid wire for gas shield arc welding

PROBLEM TO BE SOLVED: To provide a method for applying a lubricant to a welding wire, where the lubricant can uniformly be applied to the surface of the welding wire in its longitudinal direction to obtain the wire having stable wire-feedability and arc-stability, emitting small amount of fume, and having excellent welding workability SOLUTION: A complex lubricant, in which at least one kind of oils selected from a group of vegetable oils, animal oils, mineral oils, and synthetic oils is contained as a base oil and at least one kind of solid powders selected from a group of MOS 2 , WS 2 , C, and polytetrafluoroethylene (PTFE) is dispersed, is used The complex lubricant of liquid is weighed and delivered by a metering pump, atomized with compressed air or centrifugal force, and sprayed to the surface of the welding wire At that time, a voltage is applied to the atomized lubricant so that the lubricant is stuck to the surface of the welding wire by electrostatic force COPYRIGHT: (C)2004,JPO

Takaaki Ito

Papers

Ac self-shielded arc welding method

Solid wire for welding

Solid wire for mag welding

Solid wire for gas shield arc welding

Method for applying lubricant to welding wire