201139034 六、發明說明： 【發明所屬之技術領域】 本發明有關一種氣體保護電 電弧焊接裝置。 弧烊接用的經改 良的 【先前技術】 中消耗電極式或非消耗電極式的氣體保護電弧焊接 ^必須對電弧及㈣池噴出二氧化碳、氬 = =，以免大氣侵人焊錢氛内。有關這點，將保護性 =體之流量限制在-定的容許範圍内是重要的。氣體流 時，大氣侵入焊接氣氛内，t弧之狀態變得不穩 定。因此，有時發生吹孔(blow hole)，有時產生大量的 焊濺物。相反地，氣體流量太多時產生紊流，所以有時 發生保護不良，有時發生焊接滲透(wel(1 penetration)不 足。結果，有時焊珠之外觀惡化，焊接不良。 一般的電弧焊接裝置使用電磁閥來控制保護性氣 體之喷出及停止。在此情況，打開電磁閥開始焊接之際 之前流(pre-flow)處理中，過剩的流量的保護性氣體會喷 出。以下，將此現象表達為突流。突流之尖峰流量及持 續時間依據配管長度、壓力、從上次之氣體停止起算的 經過時間等而各有不同。因此，喷出保護性氣體之後直 到流量落入容許範圍為止的時間也不同。從上次之氣體 停止起算的經過時間係指在複數個焊接區間連續存在 的情況，在上次之焊接區間停止保護性氣體後的經過時 間。 第五圖繪示依據從上次之氣體停止起算的經過時 201139034 間而不同的氣體流量的時間變化。氣體之設定流量 公升/分。第五圖之(a)綠示從上次&氣體停止起丄^15 時間為4秒時之氣體流量之時間變化。第五圖之 分別繪示從上次之氣體停止起算的經過時間為3秒、2 秒、1秒、0.5秒時之流量變化。如第五圖所示，打^電 磁閥後的短暫期間，突流導致過剩流量的氣體噴出。此 外，氣體流里卩現著時間的經過而接近設定流量（1 $公升/ 分）。在前流時間設定為0.5秒時，在第五圖之(a)之情 況，保瘦性氣體以約42公升/分之流量正在噴出時進行 起弧(arc start)處理。在此情況，可能會發生上述之焊接 不良。 用以在焊接開始時抑制突流的技術揭露於特開昭 62-207584號公報及特開2〇〇6_326677號公報。特開昭 62-207584號公報揭露一種電弧焊接裝置，將串聯設置 的二個電磁閥同時0N或〇FF(習知技術丨）。特開 2__32667m揭露具備限流孔等機械性氣體流量 控制手段的焊接裝置（習知技術2)。依據 習知技術1、2 使用機械性手段來抑制突流，藉此能防止焊接不良之每 生，也能節約保護性氣體之消費量。 此外’不僅要抑制焊接開始時之突流，還必須將1 弧焊接中之氣體流量維持於最適的流量。如上所述，p ^始時突流平靜後，氣體流量趨近由氣體流量調整！ 的设定流量’之後，維持於一定的值。當氣體分 :用自二電：時J烊接不良不會發生。然而，如; 個工#且右、^接機等電弧焊接裝置來焊接，則往往一 板;"等i個焊接部位。此外，開槽形狀、焊接法 焊接部位而各有不同。在此情況，希1 依糾接雜來變更保護性氣體之氣體流量。例如：7j 201139034 平填角的情況相較於開槽形狀為重疊填 用較少的保護性氣體之設定流量。 體流量調整器維持於一定的值。因^氣體流量被氣 時多量氣體以一定流量使用，保護性广2弧焊接中，有 用以解決此課題的技術揭露於=、'被浪費。 公報。特開平8-200634號公報揭露一二平8-20〇634號 使用質量流控制器來動態控制氣體、、&?氣體加工裝置， 般說來，質量流控制器能從外(習知技術3)。-控制器内搭載著氣體流量檢測器及量。質量流 用該氣體流量檢測器及該氣體流器。利 體流量控制在設定值 。此外，即 將實際的氣 體，也能輸出或停止氣體。依據習知7:里流控制器單 量動態控制並_於最相流 ，3 ’將氣體流 的消費量。 即可郎約保護性氣體 如上所述，習知技術1、2 、 時之突流，但無法動態變ρ备触二丄雖然抑制焊接開始201139034 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a gas shielded electric arc welding apparatus. Improved arc welding [Prior Art] Gas-shielded or non-consumable electrode type gas-shielded arc welding ^There must be carbon dioxide and argon == for the arc and (4) pool to avoid atmospheric intrusion. In this regard, it is important to limit the flow of protective = body to within the allowable range. When the gas flows, the atmosphere intrudes into the welding atmosphere, and the state of the t-arc becomes unstable. Therefore, a blow hole sometimes occurs, and a large amount of spatter is sometimes generated. On the other hand, when the gas flow rate is too large, turbulence occurs, so that a poor protection may occur, and weld penetration may occur (wel (1 penetration) may be insufficient. As a result, the appearance of the bead may deteriorate and the welding may be poor. General arc welding apparatus The electromagnetic valve is used to control the discharge and stop of the protective gas. In this case, in the pre-flow process when the solenoid valve is opened to start the welding, an excessive flow of protective gas is ejected. The phenomenon is expressed as a spurt. The peak flow and duration of the turbulence vary depending on the length of the pipe, the pressure, the elapsed time since the last gas stop, etc. Therefore, after the protective gas is ejected until the flow falls within the allowable range The elapsed time from the last gas stop refers to the elapsed time after the protective gas is stopped in the last welding interval in the case of multiple welding intervals. The fifth figure shows the basis from the last time. The time change of the gas flow rate between 201139034 when the gas stops counting. The set flow rate of the gas is liters/min. (a) Green shows the time change of the gas flow rate from the last & gas stop 丄 ^ 15 time is 4 seconds. The fifth figure shows the elapsed time from the last gas stop is 3 seconds The flow rate changes in 2 seconds, 1 second, and 0.5 seconds. As shown in the fifth figure, during the short period after the solenoid valve is applied, the outflow causes the gas of the excess flow to be ejected. In addition, the passage of time in the gas flow occurs. Close to the set flow rate (1 $ liter / min.) When the forward flow time is set to 0.5 seconds, in the case of (a) of the fifth figure, the lean gas is arced at a flow rate of about 42 liters/min. In this case, the above-described welding failure may occur. The technique for suppressing the outflow at the start of welding is disclosed in Japanese Laid-Open Patent Publication No. SHO-62-207584 and JP-A No. Hei. Japanese Patent Publication No. Sho 62-207584 discloses an arc welding device in which two electromagnetic valves arranged in series are simultaneously 0N or 〇FF (known technique 。). Special opening 2__32667m discloses a welding device having a mechanical gas flow control means such as a restriction orifice. (Preferred Technology 2). Based on conventional techniques 1, 2 using mechanical means to suppress the outflow, thereby preventing the occurrence of poor welding, and also saving the consumption of protective gas. In addition, 'not only to suppress the outflow at the beginning of welding, but also to weld in 1 arc. The gas flow rate is maintained at the optimum flow rate. As mentioned above, after the p ^ starts, the gas flow is approached by the gas flow rate adjustment! After the set flow rate ', it is maintained at a certain value. When the gas is divided into: : When the J connection is not good, it will not happen. However, if the welding and welding equipment such as the right and the right is connected to the arc welding device, there is often a plate; "etc. i welding parts. In addition, the groove shape, welding In the case of the welding, the gas flow rate of the protective gas is changed according to the correction. For example, the case of the 7j 201139034 flat fill angle is set to a smaller set of protective gas than the slotted shape. The body flow regulator is maintained at a certain value. Since the gas flow rate is used when a large amount of gas is used at a constant flow rate, in the wide protective arc welding, a technique for solving this problem is disclosed in =, 'was wasted. Bulletin. Japanese Patent Laid-Open No. Hei 8-200634 discloses that the first and second flats 8-20〇634 use a mass flow controller to dynamically control the gas, & gas processing device. Generally speaking, the mass flow controller can be externally (known technology) 3). - A gas flow detector and quantity are mounted in the controller. The mass flow uses the gas flow detector and the gas flow. The throttle flow is controlled at the set value. In addition, the actual gas can also output or stop the gas. According to the conventional 7: the inner flow controller dynamically controls and _ the most phase flow, 3 ′ will consume the gas flow. As described above, the prior art, 1, 2, and the sudden flow, but can not dynamically change the 备 contact, although the suppression of welding begins
之呀序圖。如第六圖 OFF變為on。第六 圖之(b)繪示將氣體控制信藏 時間變化。波形Ha係僅〇The order map. As shown in the sixth figure, OFF becomes on. Figure 6(b) shows the change in gas control envelope time. Wave Ha is only 〇
唬ΟΝ/OFF後引起氣體流量的 ^ —個電磁閥控制保護性氣體 系藉由習知技術3之質量流控 201139034 慢增加到達設定流量。質量流控制器花費某程度時間等 待實際的氣體流量到達設定流量，藉此抑制了突流。 如果在經過設定流量到達時間之前就開始焊接，則 由於必要的氣體流量尚未確保，所以可能因保護不良而 產生焊接缺陷。氣體流量到達設定流量需要某程度的時 間。因此，循環時間（cycle time)變長。雖然能利用設定 流量到達時間為約0.3秒的高性能質量流控制器，但是 非常昂貴，所以設備成本變高。 【發明内容】 本發明之目的在於提供一種電弧焊接裝置，能使用 氣體電磁閥及較便宜的質量流控制器，在焊接開始時立 即確保必要的氣體流量。 為了達成上述的目的，依據本發明之第一態樣，提 供一種電弧焊接裝置，具有質量流控制器及氣體通路， 該質量流控制器在從外部輸入信號後進行保護性氣體 之輸出、停止及流量調整，該氣體通路用以將保護性氣 體從氣體供給源經由質量流控制器供給到焊接炬。電弧 焊接裝置具備氣體電磁閥，設於焊接炬與質量流控制器 之間，及氣體控制手段5對氣體電磁閥輸出電磁閥開閉 信號以開閉氣體電磁閥，並且對質量流控制器輸出氣體 控制信號。氣體控制手段在保護性氣體之停止時首先關 閉氣體電磁閥，接著，經過規定的延遲時間後停止從質 量流控制器輸出氣體，在下次的氣體輸出時打開氣體電 磁閥，同時從質量流控制器輸出氣體。 201139034 【實施方式】 如第一圖所示，電弧焊接裝置1具備機械手 (manipulator)14、教導盤(teach pendant)i5、自動機控制 ，16及焊接電源3。機械手14對工件2自動進行電弧 ，接。機械手14具備複數個臂部及腕部、以及用以將 些部分旋轉卿的複數侧服馬達。於機械手14之 焊接炬7。藉由焊接炬7來將捲繞於 .、、，，、直杈1mm之焊條π引導到工件2上教導 得到的焊接線。 工双导 s；mi5是在將進行焊接加工的區間之各教導 為作案浐匕及焊接電壓、焊接速度等焊接條件輸入作 遲B卑鬥主Γ時、或在設定氣體流量設定值Gv及延 ⑺及延遲_ Dw “及氣體流量設定值 攸教導盤15輸出並輸入自動機控制 Λ量設定值〜係根據焊接處設定之最適氣 量設定值〜係料操作教導盤15設定 磁pm心延遲時間Dt係用以調整將後述的氣體電 m=的時機(timing)以及藉* f量流控制器31 知止乳體的時機的時間。 式動白制杰^解讀從教導盤15已輸入的作業程 i動作;ί制器16在基於解讀結果之規定的時機 輸出到機械手14。同樣地，自動機 才工制盗16將焊接控制信號Ws、雷成„ η广 體輸出信號Mg及氣體、^曰1電磁間開閉仏虎DS、氣 源3。 g 乱體机又疋信號Ms輸出到焊接電 焊接電源3根攄來自& ^ Jd4 , 焊拔恭、.店0 件2之間供給電力。再者’ 电"、R據來自自動機控制器16之電磁閥開閉信 201139034 :。二輸出焊用接以雷將後述之氣體電磁閥33開閉的指令信 量Γ源3根據氣體輸出信號吨及氣體流 器”，該另一種指令^f ^ t輸出到質量流控制 + , . 。戒用以使輸出用的保護性氣體輸 出或Γ止’或用1"設定保護性氣體之流量。 33。連f著質量流控制器31及氣體電磁閥 供來自焊接電源3之指令信號 供、，·〇保姜I·生軋體，或停止保護 量流控制器31將從貯氣—體之供給。此外貝 神洛e夕士旦烟It gas cy nder)3〇供給之保護 上為已事先設定的氣體流量設定值 V乱：磁閥33根據來自焊接電源3之信號進行開 閉0 其次說明氣體電磁閥33及質量流控制器31之位 置。 ▲如第—圖所7F ’貯氣瓶3G充填有保護性氣體。保 ，性氣體會通過上游側氣體通路3 4 a供給到質量流控制 益31。質董流控制益31調整保護性氣體之流量。流量 調整後之保護性氣體透過氣密性之隔間（chamber)32供 給到下游側氣體通路34b。下游側氣體通路3扑沿著機 械手14之側面配置《下游側氣體通路34b連接到設於 焊接炬7附近的氣體電磁閥33 ^藉由氣體電磁閥33之 開閉來將保護性氣體透過導管纜線35内部之氣體軟管 供給到焊接炬7。如此，保護性氣體會從焊接炬7喷出。 如第三圖所示’自動機控制H 16具備微電腦及各 種記憶體等。具體來說，自動機控制器16且備作業程 式解析部21、硬碟機22、執道計晝部23 ' RAM8、緩衝 器24、伺服控制部25、伺服驅動部26、現在位置龄視 部27及焊接控制部28。作為記憶手段之硬碟機22 非 201139034 揮發性記憶體。硬碟機22中寒土 a 延遲時間Dt、氣體流量設定值有作業程式Dw、 式一業程 程式解析部21將由包含在4=容：如:作業 訊等資料所組成的移動命令讀^么中的座仏及速度資 計晝部23。再者，作業程，並將該命令通知軌道 出開始及終了的時機？並：二部21求取將氣體之輸 23。 將该時機通知執道計晝部 移動以ί 式解析部21送出的各種 ㈣的移m=23㈣放於緩衝 制定焊接炬7之軌道呼食、，ι邛23根據該移動命令 已送出ίΓ二。f衝器24中存放從軌道計晝部23 23送出的執動道^全°飼=制部Μ根據從軌道計晝部 26以旋轉驅動機“ 送到健驅動部 部L h的輸出信號，賴#訊發❹I現在位置監視 各二於，動σ|5 26根據來自伺服控制部25的指令來對 2達輪出動作控制信號Me ϋ 2 ==各_編碼器 置監視部27的帛接控制部28將來自現在位 電源3。因此，ίΓ中令在適切的處理時機輸出到焊接 与執行以焊接炬7進行的焊接’或保護 s 201139034 性氣體會噴出。具體來說，焊接控制部28在由現在位 置監視部27所指定的處理時機，將使保護性氣體喷出 所必要的電磁閥開閉信號Ds、氣體輸出信號及氣體 流量設定信號Ms輸出到焊接電源3。焊接控制部28根 據來自現在位置監視部27的焊接控制命令，來輸出用 於以焊接電源3進行的焊接的焊接控制信號Ws。伺服 驅動部26根據來自伺服控制部25的驅動命令來對機械 手14之各馬達發送動作控制信號Me。 其次說明電弧焊接裝置丨的動作。當起動作 自動機控制器16時，作業程式解析部21解讀辈 Dw並運算軌道計畫^作業程式解析部21根據豆運^ 手L4之各馬達輸出動作控制信號MC， 電源3輸出焊接控制信號ws、電磁閥開閉 結果，焊接炬7往焊接開Ms等。 定值…的量的保護性氣體體流量設 當焊接炬7 了之後， 流(after-flow)控制。上述的1串後 術同樣地進行。 動乍/、上述的I知技 作ΐ程式DW#教導複數個焊接區間，則Η 速的連串私序對複數個焊接區間 j上 行。然而，本發明之目的之一 a &間依序執 始時立即確保必要的氣體流量，因此個間：接開 止時、及在下個焊接區間二^礼體之停 行如以下般的處理。 彳平4_體輸出之始時進 ffl ^ 0N/0FF(f，1 體輸出/停止)的時序圖:以;： = (氣 、J I貝深表不的凌开3 201139034The gas flow rate caused by 唬ΟΝ/OFF is controlled by a solenoid valve to control the gas flow by the mass flow control of the prior art 3, 201139034. The mass flow controller takes a certain amount of time to wait for the actual gas flow to reach the set flow rate, thereby suppressing the outflow. If welding is started before the set flow arrival time, the necessary gas flow rate is not ensured, so welding defects may occur due to poor protection. It takes a certain amount of time for the gas flow to reach the set flow rate. Therefore, the cycle time becomes long. Although it is possible to utilize a high-performance mass flow controller with a set flow arrival time of about 0.3 seconds, it is very expensive, so the equipment cost becomes high. SUMMARY OF THE INVENTION It is an object of the present invention to provide an arc welding apparatus that can use a gas solenoid valve and a relatively inexpensive mass flow controller to immediately ensure the necessary gas flow rate at the start of welding. In order to achieve the above object, according to a first aspect of the present invention, an arc welding apparatus having a mass flow controller and a gas passage for performing output and stop of a protective gas after inputting a signal from the outside is provided Flow adjustment, the gas passage is used to supply a protective gas from the gas supply source to the welding torch via the mass flow controller. The arc welding device is provided with a gas electromagnetic valve disposed between the welding torch and the mass flow controller, and the gas control means 5 outputs a solenoid valve opening and closing signal to the gas solenoid valve to open and close the gas solenoid valve, and outputs a gas control signal to the mass flow controller. . The gas control means first closes the gas solenoid valve when the protective gas is stopped, and then stops outputting the gas from the mass flow controller after a predetermined delay time, opens the gas solenoid valve at the next gas output, and simultaneously from the mass flow controller Output gas. 201139034 [Embodiment] As shown in the first figure, the arc welding apparatus 1 is provided with a manipulator 14, a teach pendant i5, an automatic machine control 16, and a welding power source 3. The robot 14 automatically performs arcing on the workpiece 2 and connects it. The robot 14 has a plurality of arms and wrists, and a plurality of side motor for rotating the portions. The welding torch 7 of the robot 14. The welding wire 7 wound around ., ,, and 1 mm is guided to the welding line taught by the workpiece 2 by the welding torch 7. The double guide s; mi5 is taught in the section where the welding process is to be carried out, and the welding conditions such as the welding voltage and the welding speed are input as the late B-class, or the set gas flow set value Gv and the delay are set. (7) and delay _ Dw "and the gas flow set value 攸 the teaching disk 15 output and input the automatic machine control 设定 set value ～ according to the optimum gas volume setting value set by the welding place ～ the material operation teaching disk 15 set the magnetic pm heart delay time Dt It is used to adjust the timing of the gas electric power m= to be described later and the timing of knowing the timing of the milk by the f-volume flow controller 31. The formula is used to interpret the work that has been input from the teaching disk 15 i action; 制 device 16 is output to the robot 14 at the timing based on the interpretation result. Similarly, the automatic machine thief 16 will weld the control signal Ws, lei „ η wide body output signal Mg and gas, ^曰1 Electromagnetic opening and closing of the tiger DS, gas source 3. g The chaotic machine and the signal Ms are output to the welding electric welding power supply. 3 摅 from & ^ Jd4, welding and plucking, shop 0 piece 2 supply power. Furthermore, 'electricity', R according to the solenoid valve opening and closing letter from the automatic machine controller 16 201139034:. The second output welding is connected to the command signal source 3 for opening and closing the gas solenoid valve 33, which will be described later, according to the gas output signal ton and the gas flow device, and the other command is output to the mass flow control +, . It is used to output or stop the protective gas for output or to set the flow rate of the protective gas. 33. Connect the mass flow controller 31 and the gas solenoid valve for the command signal from the welding power source 3. , · 〇 姜 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I The gas flow rate setting value V set in advance is disordered: the magnetic valve 33 is opened and closed based on the signal from the welding power source 3. Next, the positions of the gas solenoid valve 33 and the mass flow controller 31 will be described. ▲If the figure is shown in Fig. 7F, the gas cylinder 3G It is filled with a protective gas. The gas is supplied to the mass flow control benefit through the upstream side gas passage 34 a. The mass flow control adjusts the flow of the protective gas. The flow rate adjusted protective gas passes through the airtightness. Sexual compartment (chamber) 32 is supplied to The downstream side gas passage 3b is disposed along the side surface of the robot 14. The downstream side gas passage 34b is connected to the gas solenoid valve 33 provided near the welding torch 7, and the gas solenoid valve 33 is opened and closed by the gas solenoid valve 33. The protective gas is supplied to the welding torch 7 through the gas hose inside the duct cable 35. Thus, the protective gas is ejected from the welding torch 7. As shown in the third figure, the "automatic machine control H 16" has a microcomputer and various memories. Specifically, the automaton controller 16 is provided with a work program analysis unit 21, a hard disk drive 22, an obedience calculation unit 23' RAM8, a buffer 24, a servo control unit 25, a servo drive unit 26, and the current position. The view unit 27 and the soldering control unit 28. The hard disk drive 22 as a memory means is not a 201139034 volatile memory. The hard disk machine 22 has a cold earth a delay time Dt, and the gas flow rate set value has a work program Dw and an industry program. The analyzing unit 21 reads the coordinates and the speed component 23 included in the movement command composed of the data including the data such as the job information, and the operation procedure, and notifies the track to start the operation. And the end of the time? The second part 21 obtains the gas to be delivered 23. The timing is notified to the obligatory metering unit to move the various types of (4) sent by the analysis unit 21 to m=23 (4), and the buffer is used to determine the orbital feeding of the welding torch 7, The ι邛23 has been sent according to the movement command. The f-crusher 24 stores the escrow path sent from the arbitrage unit 23 23, and the turf is driven by the trajectory unit 26 from the trajectory. The output signal sent to the health drive unit L h is monitored by the current position monitoring, and the motion σ|5 26 is controlled by the servo control unit 25 to perform the control signal Me ϋ 2 = = The connection control unit 28 of each _encoder setting monitoring unit 27 will be from the current bit power supply 3. Therefore, it is required that the appropriate processing timing is output to the welding and the welding performed by the welding torch 7 or the protective gas is ejected. Specifically, the welding control unit 28 outputs the solenoid valve opening and closing signal Ds, the gas output signal, and the gas flow rate setting signal Ms necessary for discharging the protective gas to the welding power source at the processing timing specified by the current position monitoring unit 27. 3. The welding control unit 28 outputs a welding control signal Ws for welding by the welding power source 3 based on the welding control command from the current position monitoring unit 27. The servo drive unit 26 transmits an operation control signal Me to each of the motors of the robot 14 in accordance with a drive command from the servo control unit 25. Next, the operation of the arc welding device 丨 will be described. When the motion robot controller 16 is activated, the work program analysis unit 21 interprets the generation Dw and calculates the track plan. The work program analysis unit 21 outputs the operation control signal MC based on the motors of the bean machine L4, and the power source 3 outputs the welding control signal. Ws, solenoid valve opening and closing results, welding torch 7 to weld open Ms and so on. The amount of protective gas body flow of the constant value is set to be after-flow control after the welding torch 7 is turned off. The above-described one-string sequel is performed in the same manner. The above-mentioned I knowing program DW# teaches a plurality of welding intervals, and the idle series of private sequences is applied to a plurality of welding intervals j. However, one of the objects of the present invention a & immediately ensures the necessary gas flow rate when starting, so that the following: the opening and closing, and the next welding interval, the following stops are treated as follows .彳平4_body output at the beginning of the ffl ^ 0N/0FF (f, 1 body output / stop) timing diagram: to;: = (gas, J I deep table does not open 3 201139034
He繪示在第四圖（a)及第四圖（b)所示的時機將保護性氣 體停止及輸出後的狀況下的氣體流量之時間變化。為了 與基於本發明之波形He作比較，以第四圖（c)之點線表 示習知技術的波形Ha及波形Hb。波形Ha係僅以一個 電磁閥控制保護性氣體之流量後的波形，波形Hb係藉 由習知技術3之質量流控制器控制氣體流量後的波形。 [1.時刻tl] 時刻tl係後流處理完畢的時機。如第四圖（a)所示， 自動機控制器16透過焊接電源3僅對氣體電磁閥33輸 出閉作動信號。亦即，自動機控制器16使電磁閥開閉 信號Ds為OFF。因此，氣體電磁閥33關閉，所以保護 性氣體不會供給到氣體電磁閥33與焊接炬7之間之氣 體通路。 [2.時刻tl〜t2之期間] 時刻tl〜t2之期間中，一方面氣體電磁閥33關閉， 一方面保護性氣體從質量流控制器31繼續輸出。因此， 於質量流控制器31與氣體電磁閥33之間之氣體通路， 以平時供給時以上的壓力充填保護性氣體。此時，由於 具備氣密性之隔間32,所以防止於氣體通路内充填必要 以上的保護性氣體。 [3.時刻t2] 時刻t2係從時刻tl算起經過已預先決定的延遲時 間Dt後的時刻。自動機控制器16在時刻t2之時機透過 焊接電源3對質量流控制器31輸出氣體之停止信號。 亦即，自動機控制器16使氣體輸出信號Mg為OFF。因 此，保護性氣體之供給完全停止。 [4.時刻t3] 時刻t3係在下個焊接區間開始保護性氣體輸出的 201139034 時機。自動機控制器16為了打開氣體電磁閥33，使電 磁閥開閉信號Ds為ON。同時，為了使質量流控制器 31開始輸出氣體，自動機控制器16使氣體輸出信號Mg 為ON。 [5.時刻t3〜t4] 質量流控制器31及氣體電磁閥33同時ON，因此 質量流控制器31與氣體電磁閥33之間之氣體通路中先 前已充填的保護性氣體一口氣放出來。波形He繪示此 時的氣體流量變化。將質量流控制器31單獨使用的習 知技術3中，流量變化如波形Hb所示，可能發生流量 不足。相較之下，本發明中，如波形He所示，發生不 影響焊接品質程度的小突流，習知技術3中的氣體流量 之不足部分(斜線部)被補充。 在此，針對延遲時間Dt補充說明。保護性氣體之 流量受到從質量流控制器31到氣體電磁閥33為止的配 管長度、配管直徑、貯氣瓶30之設定壓力、設定流量、 隔間32之體積等、焊接環境中的各種因素的影響。當 然，延遲時間Dt也受到這些因素的影響，但是延遲時 間Dt較佳為設定成不影響焊接品質程度之突流發生的 時間。申請人準備了數十種型態的上述焊接環境，邊嘗 試錯誤邊反覆實驗。結果，申請人發現了期待的延遲時 間Dt約為0.5〜0.6秒。當然，在不含於上述型態的焊 接環境的情況，有時上述的值不適合作為延遲時間Dt。 在此情況，藉由實驗求出基於焊接環境的延遲時間，或 是根據實際的焊接施工結果來重新斟酌基準值，如此之 後再以教導盤15調整即可。 依據上述的實施形態，能發揮如以下般的作用效 果。 12 201139034 ji)，弧焊接農置具備氣體電 為31。保護性氣體停止時，首^貝里机控制 在經過規定的“ ‘閥止」言號以停止保護性氣體。因此，；氣;: 力以上的保Ϊ二制器尺之間之氣體通路充填規定i 體=問及質量流控制器雙方同時從; 軋體電磁龆U彻折旦； 利》孔隨因此，於 填的保護性氣體'^ ^ 31之㈤之11體通路已充 品質程度的小突泣，故处^。因此，發生不影響焊接 體流量。L卜：广匕立即確保焊接開始所必要的氣 所以能“:不必等待氣體流量到達設定流量， 通路與氣體電磁閥33之間之氣體 間32^f _性氣體封閉在内的氣密性之隔 因此，防止氣體通路域必要以上的倾性氣體。 31淮⑺由!^由自動機控制器16來控制質量流控制器 1進仃之讀輸出，所以在不使㈣別的 提下即可發揮上述的效果。 別 (4)延遲時間Dt係能由教導盤15設定。因此， 之直徑、氣體壓力等焊接環境來任意設 上述的實施形態也可以如以下般變更。 >上述的實施形態中，也可以將質量流控制器”及 氧體電磁Η 33直接連接到自動機控制器16。在 ， 電磁閥開閉信號Ds、氣體輸出信號岣及氣體流量設定 信號Ms分職自動機控制器16直接輸 器31及氣體電磁閥33。 @ 201139034 【圖式簡單說明】 第一圖係繪示本發明電弧焊接裝置的方塊圖。 第二圖係用以說明電弧焊接裝置氣體通路的示意 圖。 第三圖係繪示自動機控制器的方塊圖。 第四圖係用以說明保護性氣體輸出控制的時序圖。 第五圖係用以說明氣體突流的曲線圖。 第六圖係繪示習知保護性氣體流量變化的曲線圖。 【主要元件符號說明】 1 電弧焊接裝置 16 自動機控制器 2 工件 30 貯氣瓶 3 焊接電源 31 質量流控制器 7 焊接炬 32 隔間 13 焊條 33 氣體電磁闕 14 機械手 34a 上游側氣體通路 15 教導盤 34b 下游側氣體通路 14He shows the time change of the gas flow rate in the case where the protective gas is stopped and output at the timing shown in Figs. 4(a) and 4(b). For comparison with the waveform He based on the present invention, the waveform Ha and the waveform Hb of the prior art are shown by the dotted line of the fourth diagram (c). The waveform Ha is a waveform in which the flow rate of the protective gas is controlled by only one solenoid valve, and the waveform Hb is a waveform obtained by controlling the flow rate of the gas by the mass flow controller of the prior art 3. [1. Time t1] Time t1 is the timing at which the flow processing is completed. As shown in the fourth diagram (a), the automaton controller 16 outputs only the closing signal to the gas solenoid valve 33 via the welding power source 3. That is, the automaton controller 16 turns off the solenoid valve opening and closing signal Ds. Therefore, the gas solenoid valve 33 is closed, so that the protective gas is not supplied to the gas passage between the gas solenoid valve 33 and the welding torch 7. [2. Period of time t1 to t2] In the period from time t1 to t2, on the one hand, the gas solenoid valve 33 is closed, and on the other hand, the protective gas is continuously output from the mass flow controller 31. Therefore, the gas passage between the mass flow controller 31 and the gas solenoid valve 33 is filled with the protective gas at a pressure equal to or higher than that at the time of normal supply. At this time, since the airtight compartment 32 is provided, it is prevented that the gas passage is filled with a protective gas or more. [3. Time t2] The time t2 is the time after the predetermined delay time Dt elapses from the time t1. The automaton controller 16 outputs a stop signal of the gas to the mass flow controller 31 through the welding power source 3 at the timing of time t2. That is, the automaton controller 16 turns off the gas output signal Mg. Therefore, the supply of protective gas is completely stopped. [4. Time t3] Time t3 is the 201139034 timing at which the protective gas output starts in the next welding zone. In order to open the gas solenoid valve 33, the automaton controller 16 turns the electromagnetic valve opening and closing signal Ds ON. At the same time, in order for the mass flow controller 31 to start outputting the gas, the automaton controller 16 causes the gas output signal Mg to be ON. [5. Time t3 to t4] Since the mass flow controller 31 and the gas solenoid valve 33 are simultaneously turned on, the previously filled protective gas in the gas passage between the mass flow controller 31 and the gas solenoid valve 33 is discharged. The waveform He shows the change in gas flow at this time. In the prior art 3 in which the mass flow controller 31 is used alone, the flow rate change as indicated by the waveform Hb may cause a flow shortage. In contrast, in the present invention, as shown by the waveform He, a small outflow which does not affect the degree of welding quality occurs, and the insufficient portion (hatched portion) of the gas flow rate in the prior art 3 is supplemented. Here, the explanation is added for the delay time Dt. The flow rate of the protective gas is limited by the length of the pipe from the mass flow controller 31 to the gas solenoid valve 33, the pipe diameter, the set pressure of the gas cylinder 30, the set flow rate, the volume of the compartment 32, and the like in the welding environment. influences. Of course, the delay time Dt is also affected by these factors, but the delay time Dt is preferably set to a time when the turbulence does not affect the degree of welding quality. The applicant prepared dozens of types of the above-mentioned welding environment and tried the experiment while trying to make mistakes. As a result, the Applicant has found that the expected delay time Dt is about 0.5 to 0.6 seconds. Of course, in the case of a welding environment not containing the above type, sometimes the above values are not suitable as the delay time Dt. In this case, the delay time based on the welding environment is determined experimentally, or the reference value is re-evaluated based on the actual welding construction result, and then adjusted by the teaching tray 15. According to the above embodiment, the following effects can be exhibited. 12 201139034 ji), the arc welding farm has a gas power of 31. When the protective gas is stopped, the first ^Berry machine controls the specified " ‘valve stop' to stop the protective gas. Therefore, the gas is filled with the gas passage between the two calipers of the above-mentioned two-component caliper; the body of the mass flow controller is simultaneously from both sides; the electromagnetic field of the rolling body is 彻 彻 ;; In the filling of the protective gas '^ ^ 31 (five) of the 11 body passages have been filled with a small degree of quality, so ^. Therefore, the occurrence does not affect the flow rate of the welded body. L Bu: Hirose immediately ensures the gas necessary for the start of welding so "can not wait for the gas flow to reach the set flow rate, and the airtightness between the gas and the gas solenoid valve 33 is closed." Therefore, it is necessary to prevent the gas path domain from being more than the declination gas. 31 Huai (7) is controlled by the automaton controller 16 to control the mass flow controller 1 to read the output, so it is not necessary to make (4) (4) The delay time Dt can be set by the teaching tray 15. Therefore, the above-described embodiment can be arbitrarily set in a welding environment such as a diameter or a gas pressure. The above embodiment can be changed as follows. In the meantime, the mass flow controller" and the oxygen solenoid 33 can also be directly connected to the automaton controller 16. The solenoid valve opening and closing signal Ds, the gas output signal 岣, and the gas flow rate setting signal Ms are divided into the automatic machine controller 16 direct transmission 31 and the gas solenoid valve 33. @ 201139034 [Simple Description of the Drawings] The first figure shows a block diagram of the arc welding apparatus of the present invention. The second figure is a schematic diagram for explaining the gas passage of the arc welding device. The third figure shows a block diagram of the automaton controller. The fourth figure is a timing diagram for explaining the control of the protective gas output. The fifth figure is a graph for explaining the gas outflow. The sixth figure is a graph showing the variation of the conventional protective gas flow rate. [Main component symbol description] 1 Arc welding device 16 Automatic machine controller 2 Workpiece 30 Gas cylinder 3 Welding power source 31 Mass flow controller 7 Welding torch 32 Compartment 13 Welding rod 33 Gas electromagnetic 阙 14 Robot 34a Upstream gas passage 15 Teaching tray 34b downstream side gas passage 14