JPS6210749B2 - - Google Patents
Info
- Publication number
- JPS6210749B2 JPS6210749B2 JP14714384A JP14714384A JPS6210749B2 JP S6210749 B2 JPS6210749 B2 JP S6210749B2 JP 14714384 A JP14714384 A JP 14714384A JP 14714384 A JP14714384 A JP 14714384A JP S6210749 B2 JPS6210749 B2 JP S6210749B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- small diameter
- gas
- pipe
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000003466 welding Methods 0.000 claims description 52
- 239000007789 gas Substances 0.000 claims description 24
- 239000011261 inert gas Substances 0.000 claims description 13
- 238000012856 packing Methods 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 22
- 229910052786 argon Inorganic materials 0.000 description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
Description
【発明の詳細な説明】
本発明はチタンの溶接或は他のシールドを必要
とする溶接を行なうにあたつての溶接時の不活性
ガス、例えばアルゴンガスなどによるシールド性
能を向上させることを目的に発明された不活性ガ
スによる89.1mm外径（３インチ）以下の比較的小
径管の手動溶接におけるシールド溶接装置に係る
ものである。[Detailed Description of the Invention] The purpose of the present invention is to improve the shielding performance of an inert gas such as argon gas during welding when welding titanium or other welding that requires shielding. This invention relates to a shield welding device for manual welding of relatively small diameter pipes with an outer diameter of 89.1 mm (3 inches) or less using an inert gas, which was invented in 1999.
特にこゝでは、チタンの溶接に重点を置いて記
述する。チタンは高温で他の元素との親和力が強
く、それらと反応した場合には、耐食性の劣化や
ぜい化が起る。その為、溶接に際しては、充分な
アルゴンガスによるシールドが必要であり、これ
を完全に行なうために溶接ビード表面及び裏面と
もアルゴンガスにより空気と置換して溶接するの
が通常である。 In particular, we will focus on welding titanium. Titanium has a strong affinity with other elements at high temperatures, and when it reacts with them, corrosion resistance deteriorates and embrittlement occurs. Therefore, during welding, it is necessary to shield with sufficient argon gas, and in order to do this completely, it is usual to weld both the front and back surfaces of the weld bead by replacing the air with argon gas.
チタン材の用途としては、一般的には石油化学
工業、肥料工業、ソーダ工業などの反応塔、蒸溜
塔及び海水淡水化装置の復水器などに利用されて
いる。 Titanium materials are generally used in reaction towers, distillation towers, and condensers of seawater desalination equipment in the petrochemical industry, fertilizer industry, soda industry, etc.
チタンは溶接時、高温にさらされると、その時
のシールド状態により、表面が順次に銀色、金
色、青色、紫色、灰白色に変化する。溶接の際に
銀色、金色、青色、紫色への変化迄は、健全溶接
部とみなされ、機械的性質や耐食性にほとんど影
響がないとされている。 When titanium is exposed to high temperatures during welding, its surface changes sequentially to silver, gold, blue, purple, and grayish white depending on the shielding state at that time. During welding, a weld that turns silver, gold, blue, or purple is considered to be a sound weld and has little effect on mechanical properties or corrosion resistance.
しかしながら実際には、上記の紫色の条件に入
れるには、アルゴンガスによる完全なシールド装
置が現在のところない為に、困難である。実験程
度の装置であれば条件のよい室内や工場でも可能
であるが、現場における条件は風もありかなり困
難になる。特に溶接用電極（トーチ）の中心から
40〜50mmの近辺では、溶接時の熱による乱流が起
こり、空気の巻き込みを起こす原因になる。チタ
ン溶接の場合、空気の巻込みが４〜５％以下、酸
素の含有量にもよるが、酸素だけで考えると１％
以下であれば良好な溶接が可能である。 However, in reality, it is difficult to meet the above purple conditions because there is currently no complete shielding device using argon gas. With experimental equipment, it is possible to do this indoors or in a factory under good conditions, but the conditions in the field are quite difficult due to the wind. Especially from the center of the welding electrode (torch)
In the vicinity of 40 to 50 mm, turbulent flow occurs due to the heat during welding, causing air to be entrained. In the case of titanium welding, air entrainment is less than 4-5%, depending on the oxygen content, but when considering oxygen alone it is 1%.
Good welding is possible if it is below.
本発明による装置は、特に管の溶接でも、小径
管の溶接に使用する目的で発明されたものであ
る。小径管の溶接においては、熱影響が管円周上
の全てに渡るので、部分的なシールドが完全にで
きていても、他の円周上に空気の混入があり、し
かも、550℃以上の熱影響だとすれば混入空気量
にもよるが紫色、灰白色という悪い結果はまぬか
れない。その為に本発明によるガスレンズ１６の
充填構造は第２図のように母材である管のほゞ全
周をとりまくように充填することによつて完全に
空気の巻き込みを防止した構造である。特に89.1
mm（３インチ）以下の小径管の手動溶接に使用す
る目的で発明されたものである。89.1mm以下の管
においては、上述のように熱影響が問題になる
が、本発明によるシールド溶接装置により解決す
ることができた。 The device according to the invention has been invented especially for use in the welding of small diameter pipes, also in the welding of pipes. When welding small-diameter pipes, the heat affects the entire circumference of the pipe, so even if some parts of the pipe are completely shielded, there may be air intrusion on other circumferences, and if the temperature exceeds 550°C. If it is due to thermal effects, it is inevitable that the result will be purple or grayish white, depending on the amount of air mixed in. Therefore, the filling structure of the gas lens 16 according to the present invention is such that air is completely prevented from being entrained by filling the gas lens 16 so as to surround almost the entire circumference of the tube that is the base material, as shown in Fig. 2. . Especially 89.1
It was invented for use in manual welding of small diameter pipes of mm (3 inches) or less. For pipes of 89.1 mm or less, thermal effects become a problem as described above, but this problem could be solved by the shield welding apparatus according to the present invention.
この発明は比較的小径管の溶接部分の周囲をカ
バーする枠内にガスレンズが設けられ、これに不
活性ガス供給用の散気管が配設され、前記ガスレ
ンズと枠とに溶接機先端を挿入するための開口部
と溶接窓とが夫々各別に設けられた小径管の不活
性ガスによるシールド溶接装置である。 In this invention, a gas lens is provided within a frame that covers the periphery of a welded portion of a relatively small diameter pipe, a diffuser pipe for supplying inert gas is disposed in this, and the tip of a welding machine is attached between the gas lens and the frame. This is a shield welding device using inert gas for small diameter pipes, each of which has a separate opening for insertion and a welding window.
この発明は前記の枠が被溶接管と嵌合されるた
めに上枠と下枠とに分けられて夫々にガスレンズ
が設けられ、溶接予定の最大径管と嵌合するため
の半円軸受部が前記上枠と下枠との合せ部分に形
成され、これ等の円筒壁にコ字形のパツキン溝が
形成された前記溶接装置である。 In this invention, in order to fit the pipe to be welded, the frame is divided into an upper frame and a lower frame, each of which is provided with a gas lens, and a semicircular bearing for fitting with the maximum diameter pipe to be welded. In the welding device, a U-shaped packing groove is formed in the cylindrical wall of the upper frame and the lower frame.
この発明は前記パツキン溝に更に小径管用の治
具が嵌合される前記溶接装置である。 The present invention provides the welding device in which a small diameter pipe jig is further fitted into the packing groove.
この発明は前記溶接窓の寸法が巾28〜30mm、長
さが47〜62mmである前記溶接装置である。 The present invention provides the welding device, wherein the welding window has dimensions of 28 to 30 mm in width and 47 to 62 mm in length.
前記の溶接窓４の寸法は実験による結果で上記
寸法が不活性ガスの窓４からのもれ防止と防風に
最良の寸法である。不活性ガスの供給量にも関係
があるが、防風の効果は供給量と関係なく最良で
ある。装置が大きくなつてもこの窓の寸法は上記
の寸法内である。特に防風、もれ防止カバーを用
いないでも良好な溶接が可能な溶接窓寸法であ
る。 The dimensions of the welded window 4 are the results of experiments and are the best dimensions for preventing inert gas from leaking from the window 4 and for wind protection. Although it is related to the amount of inert gas supplied, the windproof effect is best regardless of the amount supplied. The dimensions of this window remain within the above dimensions even as the device becomes larger. In particular, the welding window size allows for good welding even without the use of a windproof or leak-proof cover.
本発明の装置の構造は上枠１と下枠２がシヤフ
ト３をちようつがいにして開閉可能に形成されて
いる。上枠１の上部には溶接窓４を有するプレー
ト５と防風板６とが前後に取付けられている。上
枠１と下枠２とには、装置が可能な最大径の管の
半円軸受部１７，１７′が夫々加工されていて更
に該軸受部の円筒壁には、断面形状コ字形の溝１
３，１３′が夫々加工されている。上枠１と下枠
２とが合わさる部分における下枠２には第３図に
示すように、同様な溝１８が左右に加工されてい
て、上記の溝１３，１３′，１８には第５図に示
すような断面形状円形のパツキン１３″，１８′が
夫々はめこまれる。上枠１の溝１３，１３にはパ
ツキン１３″と同様な半円状パツキンがはめこま
れる。第３図に上枠１を開けた状態を図示する。
ガスレンズ１６は上、下枠内にステンレス製のス
チールウールをつめこみ、その上をステンレス製
の金あみで押えて形成されている。内部には、ア
ルゴンガスの散気管１９，１９′が第４図のよう
に配設されている。取付管８，１５には夫々ビニ
ールチユーブ２０が接続されて、こゝからアルゴ
ンガスが装置内に供給されるようになつている。 The structure of the device of the present invention is such that an upper frame 1 and a lower frame 2 are connected to each other by a shaft 3 so that they can be opened and closed. A plate 5 having a welded window 4 and a windbreak plate 6 are attached to the upper part of the upper frame 1 in the front and rear. The upper frame 1 and the lower frame 2 are machined with semicircular bearing portions 17 and 17', respectively, for pipes with the largest possible diameter for the device, and furthermore, a groove with a U-shaped cross section is formed in the cylindrical wall of the bearing portion. 1
3 and 13' are processed respectively. As shown in FIG. 3, similar grooves 18 are machined on the left and right sides of the lower frame 2 at the part where the upper frame 1 and the lower frame 2 meet, and the grooves 13, 13', and 18 have fifth grooves. Gaskets 13'' and 18' each having a circular cross section as shown in the figure are fitted into the grooves 13 and 13 of the upper frame 1. Semicircular gaskets similar to the packing 13'' are fitted into the grooves 13 and 13 of the upper frame 1, respectively. FIG. 3 shows a state in which the upper frame 1 is opened.
The gas lens 16 is formed by filling the upper and lower frames with stainless steel wool and pressing the top with stainless steel wire. Inside, argon gas diffuser pipes 19, 19' are arranged as shown in FIG. Vinyl tubes 20 are connected to the attachment pipes 8 and 15, respectively, from which argon gas is supplied into the apparatus.
ガスレンズ１６は上下ブロツク毎に押え棒１４
で夫々押えられている。 The gas lens 16 is attached to a presser bar 14 for each upper and lower block.
They are each being held down.
次に溶接時の管への取付であるが、仮付溶接さ
れた管に上枠１を第３図のように開いて取付け
る。レバー９をレバー溝１１に、はめこみ、ねじ
１０をしめつけて固定する。溶接に際しては、第
１０図のようにアルゴンガスのチユーブを配設し
て、管２７内の空気をアルゴンガスにより追い出
す作業から始める。アルゴンガスは空気より重い
ので、いく分管を傾斜させて管の最下位からアル
ゴンガスを供給して、最上部にバルブ２８を取付
けて、そこから空気を追い出す方法が効果的であ
る。同時に溶接装置の方にもアルゴンガスを供給
する。 Next, regarding attachment to the pipe during welding, the upper frame 1 is opened and attached to the tack-welded tube as shown in FIG. 3. Fit the lever 9 into the lever groove 11 and tighten the screw 10 to fix it. When welding, start by disposing an argon gas tube as shown in FIG. 10 and expelling the air inside the tube 27 with the argon gas. Since argon gas is heavier than air, an effective method is to incline the tube a little, supply argon gas from the bottom of the tube, and install a valve 28 at the top to expel the air from there. At the same time, argon gas is also supplied to the welding equipment.
第１０図は本発明による溶接装置の使用状態を
図示したものであるが、この場合は管を固定して
おき、腕の重みで溶接装置を少しずつ回転させな
がら溶接している状態であるが、第１１図は別に
管を一定速度で回転させる架台３０に管端を取付
け、二個のローラー３１の上に他の一方を置い
て、腕の重みで装置を固定して水平に保持しなが
ら溶接を行なうこともできる。 Figure 10 shows the state in which the welding device according to the present invention is used. In this case, the pipe is fixed and the welding device is rotated little by little by the weight of the arm while welding. In Fig. 11, the end of the tube is separately attached to a pedestal 30 that rotates the tube at a constant speed, and one of the tubes is placed on top of two rollers 31, and the device is fixed and held horizontally with the weight of the arms. Welding can also be performed.
次に本発明の装置において、最大径用軸受部１
７，１７′より小径の管外径のものを溶接しよう
とする場合は、第６図乃至第９図のような治具が
用意されているので、断面形状コ字形の溝１３，
１３′に第１図乃至第３図には図示していない
が、既に嵌め込まれている第５図のパツキン１
３″を取り外して前記の治具２１をはめこみ、穴
２３′を利用してボルト２３により内部のねじ穴
２４に夫々取付ける。パツキンは、第５図パツキ
ン１３″と同形のものを、第６図のパツキン溝１
３，１３′に夫々装着すればよい。上述のように
装置一台で、治具を交換することにより種々のサ
イズの管に使用することができるので便利で経済
的な装置である。 Next, in the device of the present invention, the bearing portion 1 for maximum diameter
7, 17', if you are trying to weld a tube with a smaller outer diameter than 7 or 17', a jig like the one shown in FIGS. 6 to 9 is available.
Although not shown in FIGS. 1 to 3, the gasket 1 shown in FIG. 5 is already fitted into 13'.
3", fit the jig 21, and use the holes 23' to attach them to the internal threaded holes 24 with bolts 23. The packing is the same as the packing 13" shown in Fig. 5, and the one shown in Fig. 6 is the same. Packing groove 1
3 and 13', respectively. As mentioned above, a single device can be used for pipes of various sizes by replacing the jig, making it a convenient and economical device.
符号２５，２５′は嵌合用凹凸である。 Reference numerals 25 and 25' indicate fitting projections and depressions.
この発明による不活性ガスによるシールド溶接
装置では、小径管の溶接の全部分を常に不活性ガ
スによつて空気から遮断しているので良好なイナ
ートガスアーク溶接を行うことが出来る。被溶接
管への取付取外し、及び溶接操作が容易に行なえ
る。管径の相違に対しては治具を用意することに
よつて多種類の管溶接に用いることが出来る。風
のある外気においても良好な溶接を行える。 In the inert gas shield welding apparatus according to the present invention, the entire welding portion of the small diameter pipe is always shielded from air by the inert gas, so that good inert gas arc welding can be performed. Easy to attach and detach from the pipe to be welded and welding operations. By preparing a jig for different pipe diameters, it can be used for welding many types of pipes. Good welding can be performed even in windy outside air.
第１図はこの発明による溶接装置の斜視図、第
２図及び第３図は第１図の溶接装置の内部を見た
斜視図、第４図は散気管の斜視図、第５図はパツ
キンの斜視図、第６図は治具の正面図、第７図は
その側面図、第８図は治具の正面図、第９図はそ
の側面図、第１０図は溶接作業を示す斜視図、第
１１図は他の溶接作業機を示す斜視図である。
図面中、符号１は上枠、２は下枠、３はシヤフ
ト、４は溶接窓、５はプレート、６は防風板、
８，１５は取付管、９はレバー、１０はねじ、１
１はレバー溝、１３，１３′，１８は溝、１３″，
１８′はパツキン、１４は押え棒、１６はガスレ
ンズ、１７，１７′は最大径用軸受部、１９，１
９′は散気管、２０はビニールチユーブ、２１は
治具、２３はボルト、２３′は穴、２４はねじ
穴、２５，２５′は嵌合用凹凸、２７は管、２８
はバルブ、３０は架台、３１はローラーである。
FIG. 1 is a perspective view of a welding device according to the present invention, FIGS. 2 and 3 are perspective views of the inside of the welding device shown in FIG. 1, FIG. 4 is a perspective view of an aeration pipe, and FIG. Fig. 6 is a front view of the jig, Fig. 7 is a side view thereof, Fig. 8 is a front view of the jig, Fig. 9 is a side view thereof, and Fig. 10 is a perspective view showing welding work. , FIG. 11 is a perspective view showing another welding machine. In the drawing, 1 is the upper frame, 2 is the lower frame, 3 is the shaft, 4 is the welding window, 5 is the plate, 6 is the windbreak plate,
8 and 15 are mounting pipes, 9 is a lever, 10 is a screw, 1
1 is the lever groove, 13, 13', 18 is the groove, 13'',
18' is a gasket, 14 is a presser bar, 16 is a gas lens, 17 and 17' are bearing parts for the maximum diameter, and 19 and 1
9' is a diffuser pipe, 20 is a vinyl tube, 21 is a jig, 23 is a bolt, 23' is a hole, 24 is a screw hole, 25, 25' are unevenness for fitting, 27 is a tube, 28
30 is a valve, 30 is a stand, and 31 is a roller.
Claims (1)
枠内にガスレンズが設けられ、これに不活性ガス
供給用の散気管が配設され、前記ガスレンズと枠
とに溶接機先端を挿入するための開口部と溶接窓
とが夫々各別に設けられた小径管の不溶性ガスに
よるシールド溶接装置。 ２ 前記の枠が被溶接管と嵌合されるために上枠
と下枠とに分けられて夫々にガスレンズが設けら
れ、溶接予定の最大径管と嵌合するための半円軸
受部が前記上枠と下枠との合せ部分に形成され、
これ等の円筒壁にコ字形のパツキン溝が形成され
た前記特許請求の範囲第１項記載の小径管の下活
性ガスによるシールド溶接装置。 ３ 前記パツキン溝に更に小径管用の治具が嵌合
される前記特許請求の範囲第２項記載の小径管の
不活性ガスによるシールド溶接装置。 ４ 前記溶接窓の寸法が巾28〜30mm、長さが47〜
62mmである前記特許請求の範囲第１項乃至第３項
記載の小径管の不活性ガスによるシールド溶接装
置。[Scope of Claims] 1. A gas lens is provided within a frame that covers the periphery of a welded portion of a relatively small diameter pipe, and a diffuser tube for supplying inert gas is provided in this, and the gas lens and frame are provided with a diffuser pipe for supplying inert gas. A shield welding device using insoluble gas for small diameter pipes, each having a separate opening for inserting the tip of a welding machine and a welding window. 2 In order to fit the pipe to be welded, the frame is divided into an upper frame and a lower frame, each of which is provided with a gas lens, and has a semicircular bearing part to fit with the maximum diameter pipe to be welded. formed at the joint portion of the upper frame and the lower frame,
A shield welding apparatus using active gas under a small diameter pipe according to claim 1, wherein a U-shaped packing groove is formed in the cylindrical wall of the small diameter pipe. 3. The apparatus for shield welding small diameter pipes using inert gas according to claim 2, wherein a jig for small diameter pipes is further fitted into the packing groove. 4 The dimensions of the welding window are width 28~30mm and length 47~
A shield welding apparatus using an inert gas for small diameter pipes according to claims 1 to 3 having a diameter of 62 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14714384A JPS6127172A (en) | 1984-07-16 | 1984-07-16 | Shielded welding equipment by inert gas of small diameter pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14714384A JPS6127172A (en) | 1984-07-16 | 1984-07-16 | Shielded welding equipment by inert gas of small diameter pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6127172A JPS6127172A (en) | 1986-02-06 |
| JPS6210749B2 true JPS6210749B2 (en) | 1987-03-07 |
Family
ID=15423551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14714384A Granted JPS6127172A (en) | 1984-07-16 | 1984-07-16 | Shielded welding equipment by inert gas of small diameter pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6127172A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62227580A (en) * | 1986-03-28 | 1987-10-06 | Nuclear Fuel Ind Ltd | End plug welding equipment for spacer supporting rod |
| JP2003001422A (en) * | 2001-06-20 | 2003-01-08 | Shinba Iron Works Inc | Shielding device for welding |
| KR20030085230A (en) * | 2002-04-29 | 2003-11-05 | 한국항공우주산업 주식회사 | Welding back-up bar |
| CN105057860B (en) * | 2015-08-17 | 2017-03-01 | 中国能源建设集团山西电力建设有限公司 | Bevel for welding argon-filling device |
| CN112872702A (en) * | 2021-01-25 | 2021-06-01 | 天津建工城市建设发展有限公司 | Sanitary seamless stainless steel pipe welding auxiliary device and construction method thereof |
-
1984
- 1984-07-16 JP JP14714384A patent/JPS6127172A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6127172A (en) | 1986-02-06 |
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