JPS63256292A - Backing strip for welding - Google Patents
Backing strip for weldingInfo
- Publication number
- JPS63256292A JPS63256292A JP8813487A JP8813487A JPS63256292A JP S63256292 A JPS63256292 A JP S63256292A JP 8813487 A JP8813487 A JP 8813487A JP 8813487 A JP8813487 A JP 8813487A JP S63256292 A JPS63256292 A JP S63256292A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- refractory material
- bead
- backing
- backing material
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000011819 refractory material Substances 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 28
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 101100398412 Arabidopsis thaliana ASK1 gene Proteins 0.000 claims 1
- 239000011324 bead Substances 0.000 abstract description 40
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000155 melt Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 abstract 2
- 230000035515 penetration Effects 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 23
- 239000000203 mixture Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000000470 constituent Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000001629 suppression Effects 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3607—Silica or silicates
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は片面アーク溶接において、耐溶損性が良好でア
ンダーカット、オーバーラツプ等の欠陥がなく、良好な
ビード外観を得ることのできる溶接用真当材に関するも
のである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a welding stem that has good corrosion resistance, is free from defects such as undercuts and overlaps, and can obtain a good bead appearance in single-sided arc welding. It is related to the material in question.
従来の片面溶接用裏当材（以下、裏当材という）には、
（ａ）耐火性材料を固化成形したタイプ、（ｂ）無機質
のガラス繊維をテープ状にしたタイプ、及び（Ｃ）固形
耐火材の上部にガラス繊維を配したタイプ等がある。こ
のうち耐火性材料を固化成形した裏当材は、持ち運びが
簡単で、鋼板にセットしやすくまた裏ビード規制力も良
好なため、Ｃ０２ガス溶接のような比較的小人熱の溶接
法と組合わせ、下向き溶接ばかりでなく立向き、上向き
溶接にも広く用いられている。ただし、この種の裏当材
においても常に良好な裏ビードを得るには、固形耐火材
の組成および物性について充分検討することが必要であ
り、単純な耐火物の選択では種々の欠陥が発生する。即
ち、固形耐火材の耐火性が小さいとビードが過大となり
、また耐火度を上げ過ぎると裏当材が溶融し難く溶接金
属の止端のなじみ性が不良となり、裏ビードが形成され
難くオーバーラツプ等の欠陥を生じ易く、外観の優れた
裏ビード溶接部を得ることが困難である。これらの問題
点の改善を目的として、特開昭５９−１３７１９３号公
報では組成と気孔率を規定した裏当材が提案され、特開
昭６０−１５８９９７号公報では組成を規定し、熱伝導
率の低い裏当材が提案されている。また、特開昭６１−
２０６５９０号公報では裏当材の組成、水分量を規定し
、さらに特定の複合酸化物の結晶を存在させる方法が提
案されている。これらの構成要件は、良好なビードを得
るためにはそれぞれ必要であるが、均一でかつ良好なビ
ードを得るためには裏当材の組成と共に耐火度が最も重
要な要件であり、上記裏当材はこの点での検討が充分な
されているものとは言い難い。即ち、優れた裏当材を得
るには、ビードの抑制、均一に作用する耐火度と表面の
平滑化、アンダカットの防止等の要因に重要である組成
、およびスラグ生成量に関連する気孔率について同時に
検討されたものが必要である。Conventional backing materials for single-sided welding (hereinafter referred to as backing materials) include:
There are (a) a type made of solidified refractory material, (b) a tape-shaped type made of inorganic glass fiber, and (C) a type made of solid refractory material with glass fiber arranged on top. Among these, the backing material made by solidifying and molding a fire-resistant material is easy to carry, easy to set on a steel plate, and has good back bead control force, so it can be combined with a relatively low-heat welding method such as C02 gas welding. It is widely used not only for downward welding but also for vertical and upward welding. However, in order to always obtain a good backing bead with this type of backing material, it is necessary to carefully consider the composition and physical properties of the solid refractory material, and various defects may occur if a simple refractory material is selected. . In other words, if the fire resistance of the solid refractory material is low, the bead will be too large, and if the fire resistance is increased too much, the backing material will be difficult to melt and the toe of the weld metal will have poor conformability, making it difficult to form a back bead, resulting in overlapping, etc. It is difficult to obtain a back bead weld with an excellent appearance. In order to improve these problems, JP-A-59-137193 proposed a backing material with specified composition and porosity, and JP-A-60-158997 proposed a backing material with specified composition and thermal conductivity. A backing material with a low Also, JP-A-61-
Japanese Patent No. 206590 proposes a method in which the composition and moisture content of the backing material are specified, and furthermore, crystals of a specific composite oxide are made to exist. Each of these constituent requirements is necessary in order to obtain a good bead, but in order to obtain a uniform and good bead, the fire resistance as well as the composition of the backing material are the most important requirements. It cannot be said that sufficient consideration has been given to materials in this respect. That is, to obtain a good backing material, the composition is important for factors such as bead suppression, uniform fire resistance and surface smoothing, prevention of undercutting, and porosity related to the amount of slag formation. It is necessary to consider the following at the same time.
（発明が解決しようとする問題点）
本発明は、従来の固形耐火材よりなる裏当材の欠点を解
消し、使用人熱範囲が広く、良好な形状の裏ビードを得
ることのできる溶接用裏当材を提供することを目的とす
るものである。(Problems to be Solved by the Invention) The present invention solves the drawbacks of conventional backing materials made of solid refractory materials, has a wide user heat range, and is a welding material that can obtain a backing bead with a good shape. The purpose is to provide a backing material.
（問題点を解決するための手段）
本発明裏当材は
５ｉ（ｈ ： ４５〜７０ 重量％＾１２０ｚ
： １５〜４０ 重量％ＭｇＯ：５〜３０ 重
量％
を含有する固形耐火材よりなる裏当材において、固形耐
火材はＪＩＳ耐大度試験における溶鋼温度範囲がＳ Ｋ
１１〜Ｓ ）ｔ １５であり、かつ気孔率が２０〜４
０％を有すことを要旨とするものである。(Means for solving the problems) The backing material of the present invention is 5i (h: 45-70 wt%^120z
: 15-40% by weight MgO: 5-30% by weight In the backing material made of a solid refractory material, the solid refractory material has a molten steel temperature range of S K in the JIS strength test.
11~S) t is 15 and the porosity is 20~4
The gist is to have 0%.
まず、本発明裏当材の構成成分の種類及び含有率を定め
た理由について説明する。First, the reasons for determining the types and contents of the constituent components of the backing material of the present invention will be explained.
Ｓｌｏｗ ： ４５〜７０ 重量％固形耐火材の融
点上昇を抑制すると共にスラグ流動性、スラグ剥離性を
高める作用を有するが、４５％未満では固形耐火材の耐
火度が上昇し、スラグ層の不足から均一な裏ビードが形
成されなくなるばか°りでなく、スラグ剥離性が劣化す
る。一方、７０％を越えると耐火度が低下しスラグ過多
になるばかりでなく、スラグ流動性が過大となり形状不
均一等の欠陥が生じ易（なる。Slow: 45 to 70% by weight It has the effect of suppressing the rise in the melting point of the solid refractory material and increasing the slag fluidity and slag removability, but if it is less than 45%, the refractory degree of the solid refractory material increases and the slag layer is insufficient. Not only will a uniform back bead not be formed, but the slag removability will deteriorate. On the other hand, if it exceeds 70%, not only will the refractoriness decrease and there will be an excessive amount of slag, but also the fluidity of the slag will be excessive and defects such as non-uniformity of shape will easily occur.
Ａ文ｉ０ａ 、 １５〜４０重量％固形耐火材の耐
火度を高めると共にスラグ粘性を高める作用を有するが
、１５％未満ではこれらの作用は有効に発揮されない。A content of 15 to 40% by weight has the effect of increasing the fire resistance of the solid refractory material and increasing the slag viscosity, but if it is less than 15%, these effects are not effectively exhibited.
一方、４０％を越えると耐火温度が上昇すると共にスラ
グ粘性が過大となり、スラグ不足を生じ易くなる。On the other hand, if it exceeds 40%, the refractory temperature will rise and the slag viscosity will become excessive, making it easy to cause slag shortage.
ＭｇＯ：５〜３０ 重量％
固形耐火材の耐火度、スラグ粘性を高める作用を有する
が、こうして効果を有効に発揮させるためには、５％以
上の含有量が必要である。MgO: 5 to 30% by weight MgO has the effect of increasing the fire resistance of the solid refractory material and the slag viscosity, but in order to effectively exhibit this effect, a content of 5% or more is required.
しかし、３０％を越えると耐火度は上昇すると共にスラ
グ粘性が過大となり、スラグ不足を生じ易くなる。However, if it exceeds 30%, the refractoriness will increase and the slag viscosity will become excessive, making it easy for slag shortage to occur.
本発明が対象とする裏当材の構成成分は以上の通りであ
るが、上記構成裏当材の固形耐火材の耐火度に関しては
、ＪＩＳ耐火度試験（ＪＩＳＲ２２０４）においてＳ
Ｋ １１〜Ｓに１５であることが必要である。本発明者
等は種々実験を行ない、ＪＩＳ耐火度試験における溶鋼
温度がＳ Ｋ １１（１３１５℃）〜Ｓ Ｋ １５（１
４２０℃）の範囲を有する固形耐火材がビード形状の均
一化の点で最も良好であることを知得した。その結果を
第１図に示す、第１図は気孔率をほぼ一定範囲（２５零
〜３５零）とし、固形耐火材の成分を変えて耐火度を変
化させた実験結果である。実験条件は以下の通りである
。即ち、固形耐火材の組成を、Ｓｉｎ、 ： ４５〜７
０零、＾ｌ１２０． ： １５〜４０ｔ。The constituent components of the backing material targeted by the present invention are as described above. Regarding the fire resistance of the solid refractory material of the above-mentioned constituent backing material, the JIS fire resistance test (JISR2204) shows that
It is necessary that K11 to S be 15. The inventors conducted various experiments and found that the molten steel temperature in the JIS fire resistance test ranged from S K 11 (1315°C) to S K 15 (1
It has been found that a solid refractory material having a temperature range of 420°C is the best in terms of uniformity of bead shape. The results are shown in Fig. 1. Fig. 1 shows the results of an experiment in which the porosity was set in a substantially constant range (25 zero to 35 zero) and the refractory degree was varied by changing the components of the solid refractory material. The experimental conditions are as follows. That is, the composition of the solid refractory material is Sin: 45-7
0 zero, ^l120. : 15-40t.
ＭｇＯ： ５〜３０−の範囲で変化させ、かつＳｔＯ
，、Ａｆｆｉｘｅｓ、ＭｇＯの合計が９０％以上で残り
の成分を種々変化させ、セルロース系バインダーで混練
した後、裏当材形状に圧縮成形し１０００℃以上の高温
で焼成した。形状および構成としては、第２図（ａ）に
示すように被溶接母材の開先裏面に接する側にスラグポ
ケット２を有するタイトル状の固形耐火材１を第２図（
ｂ）に示すように鋼板への接着部５を有するアルミ箔４
に連続貼付して一体化したものである。この場合、スラ
グポケットを有する板状の固形耐火材であれば、スラグ
ポケットの形状に関わりなく本発明は有効である。この
裏当材を第３図に示すように被溶接材３の裏面にアルミ
箔４により貼付し、ビード８を形成した。同図において
１０はスラグである。なお、第２、第３図において、固
形裏当材のサイズおよび鋼板の開先角度等は以下の通り
である。MgO: Vary in the range of 5 to 30, and StO
, Affixes, MgO in total of 90% or more, the remaining components were varied, kneaded with a cellulose binder, compression molded into the shape of a backing material, and fired at a high temperature of 1000° C. or higher. As for the shape and structure, as shown in Fig. 2(a), a title-shaped solid refractory material 1 having a slag pocket 2 on the side in contact with the back surface of the groove of the base material to be welded is shown in Fig. 2(a).
Aluminum foil 4 having an adhesive part 5 to the steel plate as shown in b)
It is integrated by being attached continuously. In this case, the present invention is effective as long as it is a plate-shaped solid refractory material having slag pockets, regardless of the shape of the slag pockets. As shown in FIG. 3, this backing material was attached to the back surface of the material to be welded 3 with aluminum foil 4 to form a bead 8. In the figure, 10 is a slag. In addition, in FIGS. 2 and 3, the size of the solid backing material, the groove angle of the steel plate, etc. are as follows.
ａ＝１５ｍｍ 、 ｂｘｌ、５ｍｍ 、 ｃ＝ ８ｍ
ｍ 。a=15mm, bxl, 5mm, c=8m
m.
ｄ ｗ２５ｍｍ 、 ｅ ＝５０’
供試材としては鋼板として寸法２５ｍｎｔｘ１３０ｍｍ
’ｘ ７５０ａ＋ｍ’のＪＩＳ Ｇ ３１０６ ＳＭ−
５０Ｂ（２５ｍｍｔ）を用いた。d w 25 mm, e = 50' The sample material is a steel plate with dimensions 25 mm nt x 130 mm.
'x 750a+m' JIS G 3106 SM-
50B (25 mmt) was used.
溶接ワイヤとしてはチタニャ系フラックス人ワイヤ（１
，２ｍ＋ａφ）を用いて、溶接条件はシールドガス：
ＣＯ２１００４、２０Ｌ１／ｌｌｌ１ｎ溶接電流＝１４
０〜２２０＾
アーク電圧：２０〜２５ Ｖ
溶接速度： １５ ｃｍ／ｗｉｎ
Ｅｘｔ、 ：２５ ｍｍ である。The welding wire is Titania-based flux wire (1
, 2m+aφ), and the welding conditions were shielding gas:
CO21004, 20L1/lll1n welding current = 14
0~220^ Arc voltage: 20~25 V Welding speed: 15 cm/win Ext: 25 mm.
第１図からも明らかな様に、上記範囲の耐火度を有する
固形耐火材を用いることにより、比較的低入熱の片面溶
接の場合でも固形耐火材の一部が溶融し、ワイヤ自身か
らのスラグと供に適度なスラグ層を形成して裏ビードを
保護し、ビードの均一性、ビードのなじみ性および界面
光沢等の良好な裏ビードが得られた。耐火度が５に１１
未満の場合、片面溶接を行うと裏当材溶融量が著しく増
加し、裏ビードの余盛過多、形状不均一、アンダーカッ
ト等の欠陥が生じ易くなる。一方、耐火度がＳに１５を
越える場合、固形耐火材の溶融不足が起こり、スラグ層
が不足し、溶接金属の止端のなじみ性が不良となり、ま
た均一な裏ビードが形成されずオーバーラツプ等の欠陥
が生じ易く、優れた裏ビード溶接部が得られにくい欠点
がある。As is clear from Figure 1, by using a solid refractory material with a fire resistance within the above range, even in the case of single-sided welding with relatively low heat input, a portion of the solid refractory material melts, and the wire itself melts. A suitable slag layer was formed together with the slag to protect the back bead, and a back bead with good bead uniformity, bead conformability, and interfacial gloss was obtained. Fire resistance level 5 to 11
If it is less than 1, the amount of melting of the backing material increases significantly when single-sided welding is performed, and defects such as excessive build-up of the back bead, uneven shape, and undercuts are likely to occur. On the other hand, if the refractory rating exceeds S15, insufficient melting of the solid refractory material occurs, the slag layer is insufficient, the conformability of the weld metal toe becomes poor, and a uniform back bead is not formed, resulting in overlapping, etc. It has the disadvantage that it is easy to cause defects and it is difficult to obtain an excellent back bead weld.
次に気孔率に関してであるが、本発明における固形耐火
材の気孔率は２０〜４０％であることが必要であるが、
これは固形耐火材の気孔率が２０％未満では、スラグ層
がビードを押し上げ、余盛不足あるいは裏ビードが不揃
いになる。一方、４０％を越えると裏ビードの余盛過多
となり、アンダーカットを生じ易くなる。また、大入熱
の溶接には適用しにくくなるなど作業性が劣化する。Next, regarding porosity, it is necessary that the porosity of the solid refractory material in the present invention is 20 to 40%.
This is because if the porosity of the solid refractory material is less than 20%, the slag layer pushes up the bead, resulting in insufficient excess or uneven back bead. On the other hand, if it exceeds 40%, the back bead will be overfilled and undercuts will likely occur. In addition, workability deteriorates, such as making it difficult to apply to welding with large heat input.
なお、ここで気孔率とは、粉砕し隙間をなくした固形耐
火材の真密度（ρＩ）％隙間を有する固形耐火材の密度
（ρ、）より下記の式で得られた値を言う。Note that the porosity here refers to a value obtained from the following formula from the true density (ρI) of a solid refractory material that has been pulverized to eliminate gaps.
気孔率■ ｐｉＸ １００ （零）
（実施例）
本発明による溶接用裏当材および比較材の固形耐火材組
成および測定結果を第１表に示す。Porosity ■ piX 100 (zero) (Example) Table 1 shows the solid refractory compositions and measurement results of the welding backing material according to the present invention and the comparative material.
尚、耐火材の組成は５ｉ（ｈ ：４５〜７０ｔ１＾１２
０ｓ ：１５〜４０零、 ＭｇＯ： ５〜３０ｔ１かつ
Ｓｌｙ、、ＡＮ２’ｓ、ＭｇＯの合計が少なくとも９０
＊とし、ＺｒＯ２，ＣａＯの耐火度を上げる成分とＣａ
Ｆｚ、ＬｉＦの耐火度を下げる成分を混同して試料を製
造した。裏当材の形状は第２．３図に示したものと同じ
、実験条件は第１図の実験条件とほぼ同一としたが、溶
接電流は２００＾、アーク電圧は２５Ｖ一定とした。The composition of the refractory material is 5i (h: 45-70t1^12
0s: 15-40 zero, MgO: 5-30t1 and Sly, AN2's, MgO total is at least 90
*The components that increase the fire resistance of ZrO2 and CaO and Ca
Samples were manufactured by mixing up the components that lower the fire resistance of Fz and LiF. The shape of the backing material was the same as that shown in Fig. 2.3, and the experimental conditions were almost the same as those shown in Fig. 1, except that the welding current was 200^ and the arc voltage was constant at 25V.
第１表に示した評価基準は、Ｏ印：ビード形状良好、△
印：ビード形状やや不良、×印：ビード形状不良とした
。The evaluation criteria shown in Table 1 are O: Good bead shape, △
Mark: Slightly poor bead shape; x mark: Bead shape was poor.
第１表からも明らかなように本発明の構成条件を満たす
実施例である慟、１〜５は良好な裏ビードが得られてい
る。これにないし、陽、６以降の比較例では、本発明の
構成範囲のいずれかを欠き、以下のような問題点を生じ
る。As is clear from Table 1, good back beads were obtained in Examples 1 to 5, which are Examples satisfying the structural conditions of the present invention. In addition, the comparative examples 6 and 6 lack any of the configuration ranges of the present invention, resulting in the following problems.
Ｎｏ、６：気孔率が構成範囲の上限を越えているため、
裏ビードの余盛過多となりアン
ダーカットも発生している。No. 6: Because the porosity exceeds the upper limit of the composition range,
There is too much excess on the back bead and undercuts are also occurring.
Ｎｏ、７：気孔率が下限より小さいため、裏当材の溶融
量がほとんどなくビードを押し
上げ、ビードの不揃い、オーバーラツ
プ状のビードとなった。No. 7: Since the porosity was smaller than the lower limit, there was almost no melting amount of the backing material and the beads were pushed up, resulting in irregular and overlapping beads.
Ｎｏ、８，９：低融点のＣａＦ、、ＬｔＦにより、裏当
材の耐火度が低下し、裏ビードの余盛過多
となりアンダーカットも発生してい
る。No. 8, 9: Due to the low melting point of CaF, LtF, the fire resistance of the backing material is lowered, and the backing bead is overfilled and undercutting occurs.
Ｎｏ、 １０．１１．１２：高融点のＺｒＯ２，ＣａＯ
により裏当材の耐火度が高まり、裏当材の溶融量が
ほとんどないため溶融金属とのなじみ
が乏しく、裏ビードが不足したり、ビ
ード幅、高さが不揃でオーバーラツプ
になる。No. 10.11.12: High melting point ZrO2, CaO
This increases the fire resistance of the backing material, and since there is almost no melting amount of the backing material, it is poorly compatible with the molten metal, resulting in insufficient backing beads, uneven bead width and height, and overlap.
〔発明の効果）
本発明は以上のように構成され、裏当材を構成する組成
、気孔率および耐火度の範囲が本発明の範囲内であれば
、裏ビードの形状が均一でオーバーラツプ、アンダーカ
ットが無く、優れた品買を有する裏ビードを与える片面
溶接用裏当材を得ることができる。[Effects of the Invention] The present invention is constructed as described above, and as long as the composition, porosity, and fire resistance of the backing material are within the range of the present invention, the shape of the backing bead is uniform and there is no overlap or under-bead. It is possible to obtain a backing material for single-sided welding that has no cuts and provides a back bead with excellent quality.
第１図は固形耐火材の組成により変化した裏当材の濃側
温度および溶接電流が裏ビードにおよぼす影響を示すグ
ラフ、第２図（ａ）は本発明実施例裏当材の寸法を示す
正面図、第２図（ｂ）は同裏当材の形状を示す斜視図、
第３図は裏当材の構成および溶接後の状態を示す断面図
である。
１・・・固形耐火材 ２・・・スラグポケット３・・
・被溶接母材 ４・・・アルミ箔５・・・接着剤
８・・・ビード１０・・・スラグ。
第１図
ＥＳＪ壺ｆＩＩｉ（Ａ）
第２図
（ａ）
５：接着剤Fig. 1 is a graph showing the influence of the dark side temperature of the backing material and welding current on the back bead, which changes depending on the composition of the solid refractory material, and Fig. 2(a) shows the dimensions of the backing material according to an example of the present invention. A front view, FIG. 2(b) is a perspective view showing the shape of the backing material,
FIG. 3 is a sectional view showing the structure of the backing material and the state after welding. 1... Solid refractory material 2... Slag pocket 3...
・Base material to be welded 4... Aluminum foil 5... Adhesive
8...Bead 10...Slag. Figure 1 ESJ jar fIIi (A) Figure 2 (a) 5: Adhesive
Claims (1)
〜４０重量％、ＭｇＯ：５〜３０重量％を含有する固形
耐火材よりなる溶接用裏当材において、固形耐火材はＪ
ＩＳＲ２２０４に規定している耐火度試験における溶倒
温度範囲がＳＫ１１〜ＳＫ１５であり、かつ２０〜４０
％の気孔率を有することを特徴とする溶接用裏当材。SiO_2: 45-70% by weight, Al_2O_3: 15
In the welding backing material made of a solid refractory material containing ~40% by weight and MgO: 5 to 30% by weight, the solid refractory material is J
The melting temperature range in the fire resistance test specified in ISR2204 is SK11 to SK15, and 20 to 40
A backing material for welding characterized by having a porosity of %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8813487A JPS63256292A (en) | 1987-04-10 | 1987-04-10 | Backing strip for welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8813487A JPS63256292A (en) | 1987-04-10 | 1987-04-10 | Backing strip for welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63256292A true JPS63256292A (en) | 1988-10-24 |
Family
ID=13934457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8813487A Pending JPS63256292A (en) | 1987-04-10 | 1987-04-10 | Backing strip for welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63256292A (en) |
-
1987
- 1987-04-10 JP JP8813487A patent/JPS63256292A/en active Pending
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