36results about How to "Welding state is stable" patented technology

A control method for AC pulse arc welding performed upon application of cyclic AC welding current is provided. The welding current has a cycle including an electrode negative polarity period and an electrode positive polarity period subsequent to the electrode negative polarity period. In the control method, an electrode negative polarity base current and a subsequent electrode negative polarity peak current are applied during the electrode negative polarity period. The electrode negative polarity base current has an absolute value smaller than a first critical value, and the electrode negative polarity peak current has an absolute value greater than the first critical value. Then, an electrode positive polarity peak current is applied during the electrode positive polarity period. The electrode positive polarity peak current has a value greater than a second critical value.

Cathode electrode part 5 of flat plate-like element 1 is joined with cathode com terminal 7 with a conductive adhesive or the like. Element mounting part 6a of anode terminal 6 is provided with a pair of joint parts 6b for wrapping anode electrode part 4 from both sides. The tips of joint parts 6b and anode electrode part 4 are joined by laser welding such that the ratio (w / d) of the width (w) of each tip of joint parts 6b and the diameter (d) of the welding trace to be welded is 0.5 to 1.5, and more preferably, 0.5 to 1.25 for providing low ESR means for concentrating the quantity of heat at the time of welding on welding parts 6c without escape. Therefore, a stable welded state is obtained, so that the ESR is improved for achieving low ESR of the solid capacitor.

The invention provides a necking detection control method in the consumable electrode electric arc welding. In the consumable electrode electric arc welding, the molten drop necking detection precision can be improved. The necking of the molten drop is carried out through making the change of the resistance between a consumable electrode (1) and a base metal (2) reach to a necking detection reference value, and if the necking phenomenon is detected, the output control is carried out through reducing the welding current Iw and generating the arc in a low current state. In each short circuit, the necking detection time from the necking phenomenon detection time to the arc regeneration time is detected. When the necking detection time is below a lower limit time, 1 is subtracted from a counter, and when the necking detection time is above an upper limit time, 1 is added into a counter. When the value of the counter reaches to a negative reference value, the necking detection reference value Vtn is reduced, and when the value of the counter reaches to a positive reference value, the necking detection reference value Vtn is added. In such a manner, the necking detection reference value Vtn becomes proper, and the necking detection precision is improved.

Provided is an arc welding control method that carries out forward-reverse feed control alternately switching a welding wire feed rate (Fw) between a forward feed period and a reverse feed period and performs welding by generating a short period and an arc period, wherein during a transient welding period (Tk), a transition to the forward feed period occurs when the arc period comes during the reverse feed period and a transition to the reverse feed period occurs when the short period comes during the forward feed period, and during a steady welding period, switching is carried out alternately between a prescribed forward feed period and a prescribed reverse feed period. Thus, because forward-reverse feed control that differs from that during the steady welding period is carried out during the transient welding period (Tk), the welding state during the transient welding period (Tk) can be stabilized.

The invention discloses a welding device with a telescopic structure for agricultural machinery, which includes an anti-scalding workbench, an all-round telescopic welding device of an anti-splash high-energy fluorescent heat dissipation type, a pressure-touch induction safety multi-level tool storage device, a storage box and Height adjustment device. The invention belongs to the technical field of welding equipment, and specifically provides a principle based on the anti-Stokes effect, which uses a low-energy pump laser to excite a light receiver, and the light receiver emits high-energy fluorescence, which will directly contact with the welding arm The original energy of the light receiver is taken out of the welding arm and emitted to achieve the cooling effect, but the cooling efficiency of the light receiver is limited, so that the welding temperature of the welding arm will not be too low, adjust the welding arm to a suitable welding temperature, It can ensure the safety of the welding process of the staff and a better working environment. The telescopic welding arm can achieve the effect of all-round position change. It is a welding device with a telescopic structure for easy-to-use agricultural machinery.

PROBLEM TO BE SOLVED: To optimize penetration and a bead shape of an arc start part in two-electrode arc welding. SOLUTION: In a method for controlling arc start for two-electrode arc welding performing arc welding using a welding torch WT equipped with a consumable electrode 1a and a non-consumable electrode 1b, a consumable electrode arc 3a is generated between the consumable electrode 1a and a base material 2. Then, the consumable electrode 1a is fed at a normal feeding speed, a non-consumable electrode arc 3b is generated between the non-consumable electrode 1b and the base material 2. Thereafter, during a preheating period, a preheating current having a larger value than a normal current value is made to flow to the non-consumable electrode arc 3b, a feeding speed is switched to a preheating feeding speed that is faster than the normal feeding speed in accordance with the preheating current value. Upon completion of the preheating period, the feeding speed is switched to the normal feeding speed and, simultaneously, the current value for energizing the non-consumable electrode arc 3b is switched to the normal current value and made to shift to the normal welding state. COPYRIGHT: (C)2010,JPO&INPIT

The stability of the arc welding in which forward feeding and reverse feeding of the welding wire (1) are periodically repeated is improved. Welding is performed by repeating the forward feed and reverse feed of the feed speed (Fw) of the welding wire (1) at a given cycle (Tf) and given amplitude (Wf) to generate a short circuit period and an arc period In the arc welding control method, the period (Tf) of the feed speed (Fw) is automatically set based on the average feed speed (Far) and the welding speed (Wsr), or the welding wire deposition amount (Md) per unit welding length and / or amplitude (Wf). Furthermore, when the amplitude (Wf) changes, feedback control is performed on the forward feed side shift amount (Sf) so that the average value of the feed speed (Fw) becomes constant. Thereby, since the period (Tf) and amplitude (Wf) of a feed rate (Fw) are always set to an appropriate value, a stable welding state can be maintained.

The invention provides a necking detection and control method of melting electrode and electric arc welding in order to improve the detection precision of the necking during the melting of electrode and electric arc. The necking of droplets can be detected in a manner that the change of a resistance value between a melting electrode (1) and a base material (2) reaches to a necking detection reference value (Vtn). If necking is detected, the welding current is reduced, and output control can be conducted under the state of low current value, regenerating electric arc. The necking detection time is calculated from the detection time of the necking phenomenon to the regeneration of electric arc based on each short circuit. When the necking detection time is below a lower limit time, one is subtracted from a count value. When the necking detection time is above an upper limit time, one is added to the count value. When the count value reaches to a negative reference value, the necking detection reference value (Vtn) is reduced. When the count value reaches to a positive reference value, the necking detection reference value (Vtn) is increased. Accordingly, as the necking detection reference value (Vtn) can be appropriate, the detection precision of the necking can be improved.

The sucking pipe connection structure for rotary compressor includes casing, sucking pipe and adaptor. The casing has a through hole on one side and communicated to the sucking pipe and an inside closed space with cylinder with the sucking port; the sucking pipe penetrating the through hole in the casing is inserted into the sucking port of the cylinder; and the adaptor is set in the front of theconnecting pipe connected to a storage and has the insertion pipe inserted to transmit the work fluid from the storage to the sucking pipe. The casing with flange, the sucking pipe with flange and the adaptor with flange are connected through welding.

A squeezing detection control method is provided for consumable electrode arc welding in which a cycle of arc generation and short-circuiting is repeated between a consumable electrode and a base metal. First, squeezed droplet is detected as a premonitory sign of arc recurrence at the end of the short-circuiting. This detection is based on a fact that a squeeze detection reference value is attained by a differential value of the voltage or resistance between the consumable electrode and the base metal. Then, a welding current supplied to a short-circuit load is rapidly decreased upon detection of the squeezed droplet. Upon recurrence of the arc, the welding current is increased. This arc recurrence is detected by a fact that the differential value attains an arc recurrence reference value which is greater than the squeeze detection reference value.

The invention provides an output control method for a welding power source. When a plurality of welding power sources are used at the same time, the welding power sources are prevented from being influenced by the welding currents of other welding power sources. Therefore, the welding voltage is lowered and the welding state is made unstable. The output of a welding power source (PS1) is controlled, so that the voltage detection value is equal to a voltage preset value (Vr1). In voltage detection value (Vd), according to the through power from a welding power source of the total welding current (Ig) a common energizing the electric resistance value (Rg) path and the generated voltage (Vw1)-overlapping with the welding voltage. In a common electrical path, from the other of the energized the welding power supply with the welding current is not energized, the voltage compared to a set value (Vr1) is set to increase the voltage increase (delta Vr) detecting welding power supply is energized from the other of the welding current for a total of to the mean value of the (Igd-Id), a voltage increase the value according to the delta Vr=Rg*(Igd-Id) operation are automatically set. Therefore, it is possible to suppress the reduction of the welding voltage (Vw1).

The invention provides a control method for consumable electrode arc welding. If constriction of molten droplet is detected, a welding current powered to a short circuit load is reduced so as to generate a constriction detection and control of the arc again. A feedback control (feed speed variable control) for the feed speed (Fw) is carried out according to a manner of a welding current smoothed value (Iav) equal to a predetermined current set value, so as to weld. The control method comprises an action mode for acting the constriction detection control and a forbidden mode for forbidding the constriction detection control. A transition response time (T1) of the feedback control in the action mode is longer than that in the forbidden mode. Therefore, the feed speed (Fw) changes slowly in relative to the change of a distance between a power chip and a base material, thereby keeping the welding state stably. The method can inhibit that the welding state becomes unstable when the constriction detection control acts together with the feed speed variable control at a constant welding current.

The invention relates to a double-station automatic tooth palm welding and process grinding equipment and a welding method. For the current tricone or composite drill bit in the process of palm butt welding and surface surfacing, it is manually performed, the efficiency is low, and the technical demand for relying on human skills is very large, mainly through the welding robot for the two stations. The drill bits to be welded are welded in turn, and the drill bits to be welded at the two stations are polished in turn by the grinding mechanism. The beneficial effect of the present invention is that it has a certain degree of automation, one-time clamping, and automatically completes the automatic butt welding of two drill bits, which has the advantages of high production efficiency, stable welding state, and better protection for workers' health. .

The invention provides a forward and reverse feed AC arc welding method. In the forward and reverse feed AC arc welding method, the welding state is suppressed from becoming unstable by switching the electrode polarity. Forward and reverse feeding is performed by switching the wire feed speed (Fw) alternately between forward feed and reverse feed, and by switching the electrode polarity alternately between positive electrode polarity (EP) and negative electrode polarity (EN). In the AC arc welding method, switching of the electrode polarity (Spn) is set during a period in which the feed rate (Fw) in the forward period is decelerating. Thereby, since the electrode polarity (Spn) is switched at a constant phase of the feed rate (Fw), the molten state at the time of switching becomes constant, and thus the welding state is stabilized.

In a plasma metal insert gas arc welding method which causes a metal insert gas arc (3a) and a plasma arc (3b) to generate from a welding torch (WT), even a welding torch height (Lp) changes, a stable fused drop transition state of the metal insert gas arc can be kept. For this purpose, a plasma welding current (Iwp) is applied between a plasma electrode (1b) and a mother plate (2) for generating the plasma arc (3b). Additionally, a peak current in a peak period and a reference current in a reference period are applied between a welding wire (1a) and the mother plate (2). Furthermore, the peak period and / or the peak current is changed according to the heated length of the welding wire (1a), which is heated by the plasma arc (3b). Thus, even the welding torch height (=Lp) is changed, the unit pulse condition can be optimized correspondingly, and the stability of the fused drop transition state can be always kept.

The arc welding control method alternately switches the feeding speed (Fw) of the welding wire (1) to the forward feeding period and the reverse feeding period, controls the welding voltage (Vw) based on the voltage setting value, repeats the short circuit period and the arc period to Welding is performed, and in this arc welding control method, the smooth value of the welding voltage (Vw) is detected, and the cycle (Tf) of the feed speed (Fw) is feedback-controlled so that the smooth value of the welding voltage is equal to the voltage setting value Therefore, the period (Tf) of the feed speed (Fw) is adapted corresponding to the change of the droplet transfer state accompanying the change of the voltage setting value, so that the forward feed at the feed speed (Fw) can be suppressed. The period of feed and reverse feed is synchronously deviated from the period of short-circuit period and arc period, and the welding state can be maintained stably.

In a carbon dioxide arc welding process, the present invention prevents the arc period from being extended by the eruption of gas from a molten pool. The welding power is used to the arc welding process for repeating the short-circuit period and the arc period between a welding wire and a basic material. In a method for controlling the output of the welding power to control the output of the welding power by feedback-controlling welding voltages (Vw), welding currents (lw) are decreased to the starting point (t5) of the next short-circuit period when the phenomenon (t41, t42, and t43) in which the change rate of the welding voltages (Vw) becomes over a predetermined reference value is repeated at two or more times When the eruption of the gas is determined, the welding currents (lw) is immediately decreased to prevent the arc period from being extended longer, thereby preventing the amount of generated sputters from being increased.