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CN-122007705-A - High-toughness welding rod for backing welding and preparation method and application thereof

CN122007705ACN 122007705 ACN122007705 ACN 122007705ACN-122007705-A

Abstract

The invention belongs to the technical field of welding materials, and particularly provides a high-toughness welding rod for backing welding, which comprises a welding core and a coating wrapped outside the welding core, wherein the coating comprises, by weight, 40-46% of CaCO 3 , 20-25% of CaF 2 , 5-8% of TiO 2 , 8-12% of SiO 2 , 7-9% of Si-Fe, 4-7% of Mn, 1-3% of CeO 2 , 0.5-1% of Ni and the balance of iron powder. The high-toughness welding rod for backing welding provided by the invention is a high-toughness alkaline welding rod with low-hydrogen potassium-sodium type coating, has the advantages of small welding spatter, attractive molding, easiness in deslagging, capability of performing all-position welding, capability of performing single-sided welding and double-sided molding during backing welding of welding pipelines, low content of diffused hydrogen, excellent performance in a welding state and a heat treatment state, and capability of ensuring that the low-temperature impact energy of-50 ℃ is more than 100J. The test result [ H ] of the deposited metal by a diffusion hydrogen mercury method is less than or equal to 5mL/100g, thereby reaching the index requirement of ultra-low hydrogen. The welding head is suitable for 50 Kg-level marine engineering matched backing welding, and can be used for backing welding, repairing and the like of pipeline steel and alloy steel.

Inventors

  • LIU DONG
  • LIU FAN
  • YANG HENGCHUANG
  • JIA BO
  • CAI JUN

Assignees

  • 武汉铁锚焊接材料股份有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (10)

  1. 1. The high-toughness welding rod for backing welding comprises a welding core and a coating wrapping the welding core, and is characterized by comprising, by weight, 40-46% of CaCO 3 , 20-25% of CaF 2 , 5-8% of TiO 2 , 8-12% of SiO 2 , 7-9% of Si-Fe, 4-7% of Mn, 1-3% of CeO 2 , 0.5-1% of Ni and the balance of iron powder.
  2. 2. The high-toughness welding rod for backing welding according to claim 1, wherein the coating comprises 40% CaCO 3 , 25% CaF 2 , 5% TiO 2 , 8% SiO 2 , 7% Si-Fe, 4% Mn, 1% CeO 2 , 0.5% Ni, and 9.5% iron powder by weight.
  3. 3. The high-toughness welding rod for backing welding according to claim 1, wherein the coating comprises 46% CaCO 3 , 20% CaF 2 , 5% TiO 2 , 9% SiO 2 , 7% Si-Fe, 6% Mn, 2% CeO 2 , 1% Ni, and 4% iron powder by weight.
  4. 4. The high-toughness welding rod for backing welding according to claim 1, wherein the coating comprises, by weight, 42% CaCO 3 , 23% CaF 2 , 8% TiO 2 , 12% SiO 2 , 7% Si-Fe, 5% Mn, 1.5% CeO 2 , 0.7% Ni, and 0.8% iron powder.
  5. 5. The high-toughness welding rod for backing welding according to claim 1, wherein the coating comprises 41% CaCO 3 , 22% CaF 2 , 6% TiO 2 , 10% SiO 2 , 9% Si-Fe, 7% Mn, 3% CeO 2 , 0.8% Ni, and 1.2% iron powder by weight.
  6. 6. The high-toughness welding rod for backing welding according to claim 1, wherein the coating comprises, by weight, 42% CaCO 3 , 21% CaF 2 , 7% TiO 2 , 11% SiO 2 , 8% Si-Fe, 4% Mn, 1% CeO 2 , 0.5% Ni, and 5.5% iron powder.
  7. 7. The high-toughness welding rod for backing welding according to claim 1, wherein the coating accounts for 30-35% of the total weight of the welding rod.
  8. 8. The high-toughness welding rod for backing welding according to claim 1, wherein the welding core is H08GX steel wire.
  9. 9. The method for producing a high-toughness welding rod for backing welding according to any one of claims 1 to 8, comprising the steps of stirring and mixing the powder of the coating uniformly, adding a binder into the mixed powder, stirring, and coating the powder on the core wire to produce the high-toughness welding rod.
  10. 10. Use of the high-toughness welding rod for backing welding according to any one of claims 1-8 in backing welding and repairing of marine products of the order of 50 Kg.

Description

High-toughness welding rod for backing welding and preparation method and application thereof Technical Field The invention belongs to the technical field of welding materials, and particularly relates to a high-toughness welding rod for backing welding and a preparation method and application thereof. Background With the continuous development of the field of ocean engineering, the variety of matched welding materials required by the marine industry is more and more abundant, the requirements on the performance of the welding materials are also higher and higher, and the welding materials are required to have higher mechanical properties and excellent technological properties under extreme environmental conditions and severe service conditions. The inside of the welded pipeline cannot be polished, so that the backing welding is required to achieve the purpose of front welding and good back molding. Disclosure of Invention The invention aims to provide a welding material which meets the requirements of extreme environmental conditions and severe service conditions in the maritime industry. The invention provides a high-toughness welding rod for backing welding, which comprises a welding core and a coating wrapped outside the welding core, wherein the coating comprises, by weight, 40-46% of CaCO 3, 20-25% of CaF 2, 5-8% of TiO 2, 8-12% of SiO 2, 7-9% of Si-Fe, 4-7% of Mn, 1-3% of CeO 2, 0.5-1% of Ni and the balance of iron powder. Specifically, the coating comprises, by weight, 40% of CaCO 3, 25% of CaF 2, 5% of TiO 2, 8% of SiO 2, 7% of Si-Fe, 4% of Mn, 1% of CeO 2, 0.5% of Ni and 9.5% of iron powder. Specifically, the coating comprises, by weight, 46% of CaCO 3, 20% of CaF 2, 5% of TiO 2, 9% of SiO 2, 7% of Si-Fe, 6% of Mn, 2% of CeO 2, 1% of Ni and 4% of iron powder. Specifically, the coating comprises, by weight, 42% of CaCO 3, 23% of CaF 2, 8% of TiO 2, 12% of SiO 2, 7% of Si-Fe, 5% of Mn, 1.5% of CeO 2, 0.7% of Ni and 0.8% of iron powder. Specifically, the coating comprises, by weight, 41% of CaCO 3, 22% of CaF 2, 6% of TiO 2, 10% of SiO 2, 9% of Si-Fe, 7% of Mn, 3% of CeO 2, 0.8% of Ni and 1.2% of iron powder. Specifically, the coating comprises, by weight, 42% of CaCO 3, 21% of CaF 2, 7% of TiO 2, 11% of SiO 2, 8% of Si-Fe, 4% of Mn, 1% of CeO 2, 0.5% of Ni and 5.5% of iron powder. Specifically, the coating accounts for 30-35% of the total weight of the welding rod. Specifically, the core wire is an H08GX steel wire. The invention also provides a preparation method of the high-toughness welding rod for backing welding, which comprises the following steps of stirring and uniformly mixing the coating powder, adding a binder into the uniformly mixed powder, stirring, and wrapping the powder on a welding core to prepare the high-toughness welding rod. Specifically, the binder is potassium sodium water glass. The invention also provides application of the high-toughness welding rod for backing welding in backing welding and repairing of 50 Kg-level marine products. Compared with the prior art, the invention has the following advantages and beneficial effects: The high-toughness welding rod for backing welding provided by the invention is a high-toughness alkaline welding rod with low-hydrogen potassium-sodium type coating, has the advantages of small welding spatter, attractive molding, easiness in deslagging, capability of performing all-position welding, capability of performing single-sided welding and double-sided molding during backing welding of welding pipelines, low content of diffused hydrogen, excellent performance in a welding state and a heat treatment state, and capability of ensuring that the low-temperature impact energy of-50 ℃ is more than 100J. The test result [ H ] of the deposited metal by a diffusion hydrogen mercury method is less than or equal to 5mL/100g, thereby reaching the index requirement of ultra-low hydrogen. The welding head is suitable for 50 Kg-level marine engineering matched backing welding, and can be used for backing welding, repairing and the like of pipeline steel and alloy steel. Detailed Description The technical solutions of the present invention will be clearly and completely described in the following examples, and it is obvious that the described examples are only some examples of the present invention, but not all examples. Although representative embodiments of the present invention have been described in detail, those skilled in the art to which the invention pertains will appreciate that various modifications and changes can be made without departing from the scope of the invention. Accordingly, the scope of the invention should not be limited to the embodiments, but should be defined by the appended claims and equivalents thereof. The invention provides a high-toughness welding rod for backing welding, which comprises a welding core and a coating wrapping the welding core, wherein the coating comprises, by weight, 40-46% of CaCO 3, 20-25% of CaF 2, 5-8% o