JPS6216757B2 - - Google Patents
Info
- Publication number
- JPS6216757B2 JPS6216757B2 JP5362480A JP5362480A JPS6216757B2 JP S6216757 B2 JPS6216757 B2 JP S6216757B2 JP 5362480 A JP5362480 A JP 5362480A JP 5362480 A JP5362480 A JP 5362480A JP S6216757 B2 JPS6216757 B2 JP S6216757B2
- Authority
- JP
- Japan
- Prior art keywords
- sum
- coating
- agent
- slag
- metal
- 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 38
- 239000011248 coating agent Substances 0.000 claims description 36
- 238000000576 coating method Methods 0.000 claims description 29
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 238000005275 alloying Methods 0.000 claims description 10
- 238000005552 hardfacing Methods 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 229910001512 metal fluoride Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 3
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 3
- 239000002893 slag Substances 0.000 description 24
- 230000000694 effects Effects 0.000 description 21
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000002184 metal Substances 0.000 description 19
- 235000019589 hardness Nutrition 0.000 description 16
- 239000011324 bead Substances 0.000 description 7
- 239000011651 chromium Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- 235000019353 potassium silicate Nutrition 0.000 description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 229910052580 B4C Inorganic materials 0.000 description 2
- 229910017060 Fe Cr Inorganic materials 0.000 description 2
- 229910002544 Fe-Cr Inorganic materials 0.000 description 2
- 229910017116 Fe—Mo Inorganic materials 0.000 description 2
- 239000004111 Potassium silicate Substances 0.000 description 2
- 229910006639 Si—Mn Inorganic materials 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 2
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 229910052913 potassium silicate Inorganic materials 0.000 description 2
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- -1 Fe-Me Inorganic materials 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical group [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- BJZIJOLEWHWTJO-UHFFFAOYSA-H dipotassium;hexafluorozirconium(2-) Chemical compound [F-].[F-].[F-].[F-].[F-].[F-].[K+].[K+].[Zr+4] BJZIJOLEWHWTJO-UHFFFAOYSA-H 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Landscapes
- Nonmetallic Welding Materials (AREA)
Description
本発明は低水素系硬化肉盛用被覆アーク溶接
棒、特にクロムカーバイト、ボロンカーバイトな
どを分散析出させた極めて硬いマルテンサイト系
溶着金属を得る目的で使用される溶接棒に関する
ものである。
一般にＣ，Cr，Mo，Ｂ系の析出硬化型硬化肉
盛用被覆アーク溶接棒（以下溶接棒という）は普
通のマルテンサイト系では容易に摩耗してしまう
ような激しい土砂摩耗に対して優れた性能を示し
溶着金属の硬さにおいても高硬度のわりには比較
的安定した硬さを有する。用途としては浚渫船関
係のポンプケーシング、インペラー、ライナーま
た土木建設機械などのコンベアスクリユー、コン
クリートミキサ車などの内面の肉盛補修などに使
用されるが、一般にこの種の溶接棒は溶着金属の
組成より被覆剤中に40〜50％の合金元素を含有さ
せる必要上、溶接作業性、被覆の固着性などの被
覆剤の調整が十分なされていなかつた。溶接作業
性をみると、一般的な硬化肉盛棒と比較してもア
ーク安定性、スラグ被包性、剥離性、又やや傾斜
した母材への適用性などの面でも大巾に劣る。ま
た被覆固着性についても、溶接棒の輸送途中ある
いはアークスタート時などに強い衝撃に対して被
覆が心線より脱落または欠け落ちなどの欠陥が発
生することがあつた。
本発明は一般の硬化肉盛棒と比べても何ら遜色
のない溶接作業性および被覆の固着性を具備した
溶接棒を提供するものである。
即ち、本発明は炭酸塩１種以上の和15〜45％、
金属フツ化物１種以上の和２〜20％、金属酸化物
１種以上の和２〜30％、塗装剤１種以上の和0.5
〜10％、脱酸剤および合金剤としてSi1〜８％、
Mn0.5〜８％、Cr3〜25％、Mo1〜７％、B0.5〜
５％、グラフアイトおよび合金剤からのC8％以
下を含む被覆剤、又は更に上記被覆剤にAl，Fe
―Al，Mg，Al―Mg1種以上の和0.5〜５％を含有
させた被覆剤が被覆率25〜50％を粘結剤にて軟鋼
心線の外周に塗布されてなることを特徴とする硬
化肉盛用被覆アーク溶接棒であつて以上のような
構成とすることにより、溶接アークが安定し、溶
融スラグの粘性、流動性および表面張力を増大さ
せこれによつてスラグの除去、および傾斜してい
る母材への溶接においても、スラグの流れ落ちに
よるシールド効果の減少からくるピツト、ブロー
ホールなどの欠陥も発生せず、健全な溶着金属が
得られる。また被覆剤の調整により被覆固着性も
一般の硬化肉盛棒と同等の性能が得られるもので
ある。
以下本発明を詳細に説明する。
先ず炭酸塩（ここでいう炭酸塩とは炭酸石灰、
炭酸バリウム、炭酸マグネシウム、炭酸ナトリウ
ム、炭酸リチウム、炭酸ストロンチウムをいう）
は溶接時にCO2ガスを発生し、溶融プールを大気
から保護し、ピツト、ブローホールなどの発生を
防止して、アークの安定性などには極めて著しい
効果がある。また分解後の酸化物であるスラグは
砕け易くなり、スラグ剥離性にも効果がある。し
かしその１種以上の添加量の和が45％を超えると
過大にガスが発生し、スパツタおよびスラグが多
量に発生し、溶接棒先端にからむようになり安定
なアークは得られない。また15％末満では、アー
クの安定性およびスラグ剥離が不良となり好まし
くない。以上により炭酸塩の適正成分範囲をその
１種以上の和が15〜45％と規定した。
金属フツ化物（ここでいう金属フツ化物とは、
フツ化カルシウム、フツ化ソーダ、フツ化ジルコ
ンカリ、フツ化アルミニウム、フツ化マグネシウ
ムをいう）については、スラグの粘性、流動性を
適正な状態にしてビード形状を良好にするのに効
果がある。しかしその１種以上の和が20％を超え
るとスラグが流れやすくなりビード形状に不良を
きたすので好ましくない。また２％末満ではスラ
グの粘性が大きくなりビードの母材へのなじみが
悪くなり好ましくない。以上により金属フツ化物
の適正成分範囲をその１種以上の和が２〜20％と
規定した。
金属酸化物（ここでいう金属酸化物とは
TiO2，SiO2，ZrO2，MgO，BaO，Al2O3をい
う）については、いずれもスラグの粘性の調整に
効果があり、溶融プールの安定化、たとえば溶接
棒先端にスラグがからむようなことがなくなりア
ーク安定性の改善にも効果が大きい。この金属酸
化物の１種以上の和が30％を超えると、スラグ量
が増加して溶接棒先端にからむようになり安定し
たアーク状態は得られない。スパツタも多く発生
するようになる。また２％末満では、その効果は
乏しく不安定なアークとなり好ましくない。以上
により金属酸化物の適正成分範囲をその１種以上
の和が２〜30％と規定した。
塗装剤（ここでいう塗装剤とはマイカ、アルギ
ン酸ソーダ、澱粉、セルロース、デキストリン、
タルクをいう）は粘結剤（水ガラス）と被覆剤を
湿式混合する際に添加されるものであつて被覆剤
に粘りをもたせ、塗装作業を容易にする効果があ
り、溶接棒の製造には必須のものであるが塗装剤
の働きの他に、アークを安定するなどの効果もあ
る。これらの物質の１種以上の和が10％を超える
と被覆剤の固着が劣化し好ましくなく、又アーク
も不安定となる。0.5％未満ではこの効果は認め
られない。以上により塗装剤の適正成分範囲をそ
の１種以上の和が0.5〜10％と規定した。
脱酸剤および合金剤としてのSi，Mn，Cr，
Mo，ＢおよびＣについては複合添加することに
よつて高硬度溶着金属を得るため必須の元素であ
る。
Siについてはスラグの粘性調整と脱酸剤として
の効果は大きい。しかし８％を超えるとスラグ粘
性が過大となりビード形状、スラグ剥離性などが
劣化する。またＢ添加によりSiの歩留が大きくな
り、溶着金属中のSi量が増加する。これは溶着金
属の耐割れ性の面でも好ましくない。また１％未
満ではその効果は乏しく脱酸不足によりピツト、
ブローホールなどの欠陥が発生する。以上により
Siの適正成分範囲を１〜８％と規定した。なおSi
は金属Si，Fe―Si，Si―Mnなどの形で添加する
ことが可能である。
Mnについては溶着金属の硬さのアツプおよび
安定化に効果があり、また脱酸剤としての効果も
大きい。しかし８％を超えるとスラグ剥離の面で
劣化し、又合金剤としての効果もほぼ飽和状態と
なりそれ以上の効果は期待できない。また0.5％
未満ではその効果は乏しく脱酸不足によるピツ
ト、ブローホール、溶着金属の硬さにおいてもバ
ラツキが大きくなり好ましくない。以上により
Mnの適正成分範囲を0.5〜８％と規定した。なお
Mnは金属―Mn，Fe―Me，Si―Mnなどの形で添
加することが可能である。
Crについては溶着金属の硬さのアツプ、安定
化には大きな効果をもつ。しかし25％を超えると
残留オーステナイトの発生により硬さが低下する
傾向となり高い硬度を維持することが難かしくな
る。また８％未満ではその効果は乏しく溶着金属
の硬さの安定化が困難である。以上によりCrの
適正成分範囲は８〜25％と規定した。なおCrは
金属Cr，Fe―Crなどの形で添加することも可能
である。
Moについては硬さのアツプと安定化、および
熱に対する軟化抵抗が大きい。しかし８％を超え
るとその効果はほぼ飽和状態となりそれ以上添加
してもその効果は期待できない。また１％未満で
はその効果は認められない。以上によりMoの適
正成分範囲を１〜８％と規定した。なおMoは、
金属Mo，Fe―Moなどの形で添加することが可能
である。
Ｂについては溶接作業性の面で非常に害を及ぼ
す元素でＢ添加によりスラグの粘性が著しく不足
しビード形状、スラグ剥離性などを劣化させる。
またSiの歩留が大巾にアツプするなどの問題は
あるが溶着金属の硬さのアツプには著しく効果を
発揮する。これは溶着金属のマトリツクス中に非
常に硬いボロン炭化物を析出させ一般のマルテン
サイト系溶接棒では得られない高硬度の溶着金属
が得られる。しかし５％を超えるとスラグの粘性
が不足し、ビード形状の不良となり傾斜した肉盛
母材への適正性に欠けるようになるまた硬さにお
いてもほぼ飽和状態となりこれ以上添加してもそ
の効果は期待されない。0.5％未満ではその効果
は認められず以上によりＢの適正成分範囲を0.5
〜５％と規定した。なおＢはFe―Ｂ、硼砂など
の形で添加される。
ＣについてはＢと同様に溶着金属の硬さのアツ
プには効果は大きいが８％を超えてもそれ以上の
添加による効果は認められない。以上によりＣの
適正成分範囲を８％以下と規定した。なおＣはグ
ラフアイト、高炭素の合金剤たとえばFe―Mn，
Fe―Mo，Fe―Cr、金属Crなどの形で添加され
る。
被覆剤の心線に対する被覆率も溶接棒を製造す
る上で大きな意味をもつ合金成分とのかねあいで
あるが、50％を超えるとスラグ量が多くなりアー
ク安定性を劣化し、又製造途中特に溶接棒の乾燥
時に被覆割れが発生したり被覆固着性の劣化など
問題は大きい。また25％未満になると目標となる
合金成分が得られないこと、保護筒が薄くなり溶
接途中に欠け落ちるという問題が発生し好ましく
ない。以上より被覆率は25〜50％に規定した。
更に上記被覆剤にAl，Fe―Al，Mg，Al―Mg
の１種以上をアーク安定化を目的とした強脱酸剤
として添加することにより、アークのなめらかな
発生を促進しスパツタや溶融プールの安定化など
に効果がある。しかしその１種以上の和が0.5％
未満ではその効果は期待されず５％を超えると逆
にアークが激しくなり、スパツタの発生が多くな
る。また脱酸過多となりブローホールピツトなど
の原因となり好ましくない。以上によりAl，Mg
系成分の適正成分範囲をその１種以上の和が0.5
〜５％と規定した。
心線は軟鋼心線を用い前記被覆剤と粘結剤とし
て硅酸ソーダ、硅酸カリを主成分とする水ガラス
と混練し、それを心線の外周に溶接棒全重量に対
して25〜50％の割合で通常の溶接棒塗装機によ
り、被覆塗装するものであつてこれをほぼ100〜
200℃の範囲で加熱して予備的に乾燥したのち約
400℃で焼成を施すものである。
次に実施例に基づいて本発明の効果をさらに具
体的に説明する。
実施例
第１表に示すような被覆剤組成を第２表に示す
組成の軟鋼心線に第１表の示す被覆率で５mmφの
溶接棒を製造した。尚被覆剤の粘結剤として硅酸
カリ、硅酸ソーダよりなる通常水ガラスを使用し
た。
The present invention relates to a low-hydrogen coated arc welding rod for hardfacing, particularly to a welding rod used for the purpose of obtaining extremely hard martensitic weld metal in which chromium carbide, boron carbide, etc. are dispersed and precipitated. In general, C, Cr, Mo, and B-based precipitation-hardening coated arc welding rods (hereinafter referred to as welding rods) for hardfacing are excellent against severe earth and sand abrasion, where ordinary martensitic materials are easily worn away. The hardness of the weld metal is relatively stable despite its high hardness. Applications include pump casings, impellers, and liners for dredgers, conveyor screws for civil engineering and construction machinery, and repairing the inner surfaces of concrete mixer trucks.In general, this type of welding rod is Since it is necessary to contain 40 to 50% of alloying elements in the coating material, the welding workability and adhesion of the coating material have not been sufficiently adjusted. In terms of welding workability, it is significantly inferior to general hardfacing rods in terms of arc stability, slag encapsulation, peelability, and applicability to slightly inclined base metals. In addition, with regard to the adhesion of the coating, defects such as the coating falling off or chipping away from the core wire may occur due to strong impacts during transport of the welding rod or at the time of arc starting. The present invention provides a welding rod that has welding workability and coating adhesion that are comparable to those of general hardfacing rods. That is, the present invention contains a total of 15 to 45% of one or more carbonates,
Sum of one or more metal fluorides: 2-20%, sum of one or more metal oxides: 2-30%, sum of one or more coating agents: 0.5
~10%, Si1~8% as deoxidizer and alloying agent,
Mn0.5~8%, Cr3~25%, Mo1~7%, B0.5~
5%, C from graphite and alloying agent up to 8%, or additionally the above coatings contain Al, Fe.
- A coating material containing 0.5 to 5% of one or more of Al, Mg, Al-Mg in total is applied to the outer periphery of a mild steel core wire with a coating rate of 25 to 50% using a binder. By having a coated arc welding rod for hardfacing and having the above structure, the welding arc is stabilized, and the viscosity, fluidity and surface tension of molten slag are increased, thereby facilitating slag removal and tilting. Even when welding to a base metal that is resistant to heat, defects such as pits and blowholes, which are caused by reduced shielding effectiveness due to slag flowing down, do not occur, and a sound weld metal can be obtained. In addition, by adjusting the coating material, coating adhesion properties can be obtained that are equivalent to those of a general hardfacing rod. The present invention will be explained in detail below. First, carbonate (carbonate here refers to carbonate lime,
barium carbonate, magnesium carbonate, sodium carbonate, lithium carbonate, strontium carbonate)
It generates CO 2 gas during welding, protects the molten pool from the atmosphere, prevents pits and blowholes, and has an extremely significant effect on arc stability. In addition, the slag, which is an oxide after decomposition, becomes easier to crumble, which has an effect on slag removability. However, if the sum of the additive amounts of one or more of them exceeds 45%, excessive gas will be generated, and a large amount of spatter and slag will be generated and become entangled with the tip of the welding rod, making it impossible to obtain a stable arc. Further, if it is less than 15%, arc stability and slag peeling become poor, which is not preferable. Based on the above, the appropriate range of carbonate components was defined as 15 to 45% of the sum of one or more carbonates. Metal fluoride (metal fluoride here is
Calcium fluoride, sodium fluoride, potassium zirconium fluoride, aluminum fluoride, and magnesium fluoride) are effective in adjusting the viscosity and fluidity of the slag to appropriate conditions and improving the bead shape. However, if the sum of one or more of them exceeds 20%, the slag tends to flow easily and the bead shape becomes defective, which is not preferable. Further, if the content is less than 2%, the viscosity of the slag increases, making it difficult for the beads to fit into the base material, which is not preferable. Based on the above, the appropriate component range of metal fluorides was defined as the sum of one or more of them being 2 to 20%. Metal oxide (What is metal oxide here?
TiO 2 , SiO 2 , ZrO 2 , MgO, BaO, Al 2 O 3 ) are all effective in adjusting the viscosity of slag, stabilizing the molten pool, and preventing slag from getting entangled with the tip of the welding rod. This is highly effective in improving arc stability. If the sum of one or more of these metal oxides exceeds 30%, the amount of slag increases and becomes entangled with the tip of the welding rod, making it impossible to obtain a stable arc condition. A lot of spatter will also occur. Further, at less than 2%, the effect is poor and the arc becomes unstable, which is not preferable. Based on the above, the appropriate component range of metal oxides was defined as the sum of one or more of them being 2 to 30%. Painting agents (painting agents here include mica, sodium alginate, starch, cellulose, dextrin,
Talc (talc) is added when wet-mixing a binder (water glass) and a coating agent, and it has the effect of making the coating agent sticky and easier to paint, and is used in the production of welding rods. is essential, but in addition to acting as a coating agent, it also has effects such as stabilizing the arc. If the sum of one or more of these substances exceeds 10%, the adhesion of the coating material will deteriorate, which is undesirable, and the arc will also become unstable. This effect is not observed at less than 0.5%. Based on the above, the appropriate range of components for coating agents was defined as the sum of one or more components being 0.5 to 10%. Si, Mn, Cr, as deoxidizer and alloying agent
Mo, B and C are essential elements in order to obtain a high hardness weld metal by adding them in combination. Si has great effects in adjusting the viscosity of slag and as a deoxidizing agent. However, if it exceeds 8%, the slag viscosity becomes excessive and the bead shape, slag removability, etc. deteriorate. Furthermore, the addition of B increases the yield of Si and increases the amount of Si in the weld metal. This is also unfavorable in terms of the cracking resistance of the weld metal. In addition, if it is less than 1%, the effect is poor and pitts,
Defects such as blowholes occur. Due to the above
The appropriate Si content range was defined as 1 to 8%. Furthermore, Si
can be added in the form of metal Si, Fe-Si, Si-Mn, etc. Mn is effective in increasing and stabilizing the hardness of the weld metal, and is also highly effective as a deoxidizing agent. However, if it exceeds 8%, it deteriorates in terms of slag exfoliation, and the effect as an alloying agent is almost saturated, so that no further effect can be expected. Also 0.5%
If it is less than this, the effect will be poor and the hardness of pits, blowholes, and welded metal will vary greatly due to insufficient deoxidation, which is not preferable. Due to the above
The appropriate range of Mn content was defined as 0.5% to 8%. In addition
Mn can be added in the form of metal-Mn, Fe-Me, Si-Mn, etc. Cr has a great effect on increasing and stabilizing the hardness of the weld metal. However, if it exceeds 25%, the hardness tends to decrease due to the generation of retained austenite, making it difficult to maintain high hardness. If it is less than 8%, the effect is poor and it is difficult to stabilize the hardness of the weld metal. Based on the above, the appropriate range of Cr content was defined as 8 to 25%. Note that Cr can also be added in the form of metallic Cr, Fe-Cr, etc. Mo has increased and stabilized hardness, and has great resistance to softening against heat. However, if it exceeds 8%, the effect will be almost saturated, and no effect can be expected even if it is added more than that. Further, if it is less than 1%, no effect is observed. Based on the above, the appropriate Mo content range was defined as 1 to 8%. Furthermore, Mo is
It can be added in the form of metal Mo, Fe-Mo, etc. B is a very harmful element in terms of welding workability, and the addition of B causes a significant lack of slag viscosity and deteriorates bead shape, slag removability, etc. Also, although there are problems such as a significant increase in the Si yield, it is extremely effective in increasing the hardness of the weld metal. This precipitates very hard boron carbide in the matrix of the weld metal, resulting in a highly hard weld metal that cannot be obtained with ordinary martensitic welding rods. However, if it exceeds 5%, the slag's viscosity will be insufficient, resulting in poor bead shape and lack of suitability for sloped overlay base materials.Also, the hardness will be almost saturated, and even if it is added more than this, it will not be effective. is not expected. If it is less than 0.5%, the effect will not be recognized, and based on the above, the appropriate component range of B is 0.5%.
It was defined as ~5%. Note that B is added in the form of Fe-B, borax, etc. Similar to B, C has a large effect on increasing the hardness of the weld metal, but even if it exceeds 8%, no effect is observed by adding more than that. Based on the above, the appropriate component range of C was defined as 8% or less. Note that C is graphite, a high carbon alloying agent such as Fe-Mn,
It is added in the form of Fe-Mo, Fe-Cr, metal Cr, etc. The coating ratio of the coating material to the core wire is also a trade-off with the alloy composition, which is of great significance in manufacturing welding rods, but if it exceeds 50%, the amount of slag will increase, deteriorating the arc stability, and especially during the manufacturing process. There are serious problems such as cracking of the coating and deterioration of coating adhesion when the welding rod dries. Further, if it is less than 25%, the target alloy composition cannot be obtained, and the protective tube becomes thin and may chip off during welding, which is not preferable. Based on the above, the coverage was determined to be 25 to 50%. Furthermore, Al, Fe-Al, Mg, Al-Mg are added to the above coating material.
By adding one or more of these as a strong deoxidizing agent for the purpose of arc stabilization, smooth generation of the arc is promoted and it is effective in stabilizing spatter and molten pool. However, the sum of one or more types is 0.5%
If it is less than 5%, no effect can be expected, and if it exceeds 5%, arcing will become more intense and more spatter will occur. Moreover, excessive deoxidation may cause blowhole pits, which is undesirable. As a result of the above, Al, Mg
The sum of one or more of the appropriate component ranges for system components is 0.5
It was defined as ~5%. The core wire is a mild steel core wire, which is kneaded with the coating material and water glass whose main components are sodium silicate and potassium silicate as a binder. The coating is applied at a rate of 50% using an ordinary welding rod coating machine, and this is approximately 100% to 100%.
After preliminary drying by heating in the range of 200℃, approx.
It is fired at 400℃. Next, the effects of the present invention will be explained in more detail based on Examples. EXAMPLE A welding rod of 5 mmφ was manufactured using a coating agent composition as shown in Table 1 and a mild steel core wire having a composition shown in Table 2 and a coating ratio shown in Table 1. As a binder for the coating material, ordinary water glass made of potassium silicate and sodium silicate was used.
【表】【table】
【表】【table】
【表】【table】
【表】
第１表において記号Ａ〜Ｊは本発明例であり、
記号Ｋ〜Ｐは比較例を示したものである。これら
記号Ａ〜Ｐの溶接棒について第４表に示すような
母材上に溶接電流210A、パス間、予熱温度とも
300℃で４層盛の溶接を行ない、溶接作業性、溶
着金属の化学成分、硬さを調査した。その結果を
第５表に示す。[Table] In Table 1, symbols A to J are examples of the present invention,
Symbols KP indicate comparative examples. For these welding rods with symbols A to P, welding current of 210A, interpass, and preheating temperature are applied to the base metal as shown in Table 4.
Four-layer welding was performed at 300℃, and the welding workability, chemical composition, and hardness of the deposited metal were investigated. The results are shown in Table 5.
【表】【table】
【表】
第５表の溶接作業性結果では、本発明溶接棒記
号Ａ〜Ｊについては、アークの安定性、スラグ剥
離、ビード形状、スラグのからみなどいずれも満
足すべきものであつた。しかし比較例溶接棒であ
る記号Ｋ〜Ｐについては本発明の目的を十分に達
成することはできなかつた。溶着金属の硬さにつ
いては本発明溶接棒記号Ａ〜Ｊは第５表にみられ
るように非常に硬いHv700〜800程度のものが容
易に得られた。
なお前記の本発明溶接棒記号Ａ〜Ｊと、比較例
で示した溶接棒記号Ｋ〜Ｐの被覆脱落率を第２図
に示す被覆脱落試験機を用いて測定した結果を第
１図に示した。この場合、第２図において１は回
転箱、２はモーター、３は支持軸、４は減速部で
あり、回転箱１の寸法はａ×ｂ×ｃが700×100×
500（mm）のものを用い回転数は37rpm，試験時
間は３分とした。
この結果本発明例記号Ａ〜Ｊは比較例で示した
記号Ｋ〜Ｐに比較し良好な結果を得た。これによ
り被覆固着性も大巾に改善されたことがわかる。[Table] The welding workability results shown in Table 5 show that the welding rods A to J of the present invention were satisfactory in terms of arc stability, slag separation, bead shape, slag entanglement, etc. However, the objects of the present invention could not be fully achieved for the comparative welding rods K to P. As for the hardness of the weld metal, welding rods of the present invention with symbols A to J easily had very hard hardnesses of about Hv700 to Hv800, as shown in Table 5. Furthermore, Fig. 1 shows the results of measuring the coating shedding rate of the welding rods of the present invention with symbols A to J and the welding rods with symbols K to P shown in the comparative examples using the coating shedding tester shown in Fig. 2. Ta. In this case, in Fig. 2, 1 is a rotating box, 2 is a motor, 3 is a support shaft, and 4 is a reduction unit, and the dimensions of rotating box 1 are a x b x c = 700 x 100 x
500 (mm), the rotation speed was 37 rpm, and the test time was 3 minutes. As a result, the symbols A to J of the examples of the present invention obtained better results than the symbols K to P shown in the comparative examples. It can be seen that this greatly improved the adhesion of the coating.
第１図は本発明溶接棒と比較溶接棒との被覆脱
落率を対比した結果を示す図、第２図は被覆脱落
率の測定に用いた装置の概略図である。
１……回転箱、２……モータ、３……支持軸、
４……減速部。
FIG. 1 is a diagram showing the results of a comparison of the coating shedding rate between the welding rod of the present invention and a comparison welding rod, and FIG. 2 is a schematic diagram of the apparatus used to measure the coating shedding rate. 1...Rotating box, 2...Motor, 3...Support shaft,
4...Reduction section.
Claims (1)
属フツ化物１種以上の和２〜20％、金属酸化物１
種以上の和２〜30％、塗装剤１種以上の和0.5〜
10％、脱酸剤および合金剤としてSi1〜８％、
Mn0.5〜８％、Cr3〜25％、Mo1〜７％、B0.5〜
５％、グラフアイトおよび合金剤からのC8％以
下を含む被覆剤が被覆率25〜50％で粘結剤にて軟
鋼心線の外周に塗布されてなることを特徴とする
硬化肉盛用被覆アーク溶接棒。 ２ 重量比％で炭酸塩１種以上の和15〜45％、金
属フツ化物１種以上の和２〜20％、金属酸化物の
１種以上の和２〜30％、塗装剤１種以上の和0.5
〜10％、脱酸剤および合金剤としてSi1〜８％、
Mn0.5〜８％、Cr3〜25％、Mo1〜７％、B0.5〜
５％、グラフアイトおよび合金剤からのC8％以
下、更にAl，Fe―Al，Mg，Al―Mg1種以上の和
0.5〜５％を含有させた被覆剤が被覆率25〜50％
を粘結剤にて軟鋼心線の外周に塗布されてなるこ
とを特徴とする硬化肉盛用被覆アーク溶接棒。[Claims] 1. Sum of one or more carbonates 15 to 45%, sum of one or more metal fluorides 2 to 20%, metal oxide 1
Sum of 2 to 30% of species or more, sum of 1 or more types of coating agent 0.5 to 30%
10%, Si1-8% as deoxidizing agent and alloying agent,
Mn0.5~8%, Cr3~25%, Mo1~7%, B0.5~
A coating for hardfacing, characterized in that a coating material containing 5% or less C from graphite and an alloying agent is applied to the outer periphery of a mild steel core wire with a binding agent at a coverage rate of 25 to 50%. arc welding rod. 2 Weight ratio of 15% to 45% of one or more carbonates, 2 to 20% of one or more metal fluorides, 2 to 30% of one or more metal oxides, and 1 to 30% of one or more coating agents Sum 0.5
~10%, Si1~8% as deoxidizer and alloying agent,
Mn0.5~8%, Cr3~25%, Mo1~7%, B0.5~
5%, less than 8% C from graphite and alloying agents, and the sum of one or more types of Al, Fe-Al, Mg, Al-Mg
The coating material containing 0.5-5% has a coverage rate of 25-50%.
A coated arc welding rod for hardfacing, characterized in that a binder is applied to the outer periphery of a mild steel core wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5362480A JPS56151195A (en) | 1980-04-24 | 1980-04-24 | Low-hydrogen type coated arc welding rod for hardening and building-up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5362480A JPS56151195A (en) | 1980-04-24 | 1980-04-24 | Low-hydrogen type coated arc welding rod for hardening and building-up |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56151195A JPS56151195A (en) | 1981-11-24 |
| JPS6216757B2 true JPS6216757B2 (en) | 1987-04-14 |
Family
ID=12948056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5362480A Granted JPS56151195A (en) | 1980-04-24 | 1980-04-24 | Low-hydrogen type coated arc welding rod for hardening and building-up |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56151195A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106624454A (en) * | 2017-03-10 | 2017-05-10 | 大连智讯科技有限公司 | Low hydrogen type electrode and preparation method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR8507158A (en) * | 1985-01-17 | 1987-07-14 | Ki Polt I | ELECTRODE FOR ELECTRIC ARC FACING |
| FR2590192B1 (en) * | 1985-11-21 | 1991-08-02 | Maybon Guy | FLEXIBLE WELDING STICK WITH COATED METAL CORE, METHOD AND DEVICE FOR PRODUCING THE SAME |
| JPS63160799A (en) * | 1986-12-24 | 1988-07-04 | Nippon Steel Corp | Coated electrode for rail |
| CN104831163A (en) * | 2015-05-09 | 2015-08-12 | 芜湖鼎瀚再制造技术有限公司 | Fe-Mo-B-Al welding layer material and preparation method thereof |
| CN113245748B (en) * | 2021-07-05 | 2021-09-21 | 四川西冶新材料股份有限公司 | 14Cr1MoR matched high-toughness welding electrode for hydrogen-contacting steel |
-
1980
- 1980-04-24 JP JP5362480A patent/JPS56151195A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106624454A (en) * | 2017-03-10 | 2017-05-10 | 大连智讯科技有限公司 | Low hydrogen type electrode and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56151195A (en) | 1981-11-24 |
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