CN105750712A - Submerged-arc welding technique - Google Patents

Abstract

The invention discloses a submerged-arc welding technique. The submerged-arc welding technique includes the followings processes: 1) preparation before welding; 2) groove machining; 3) cleaning of a part to be welded; 4) assembly of a welding piece: during assembly of the welding piece, the clearance should be even, the height should be flat, alignment tolerance should be small, the length of a positioning weld joint is generally greater than 30 mm, and the quality of the positioning weld joint and the quality of a main weld joint are identical; a special tooling and a special clamp tool are adopted in case of necessity; during assembly of a straight joint welding piece, a run-on plate and a run-off plate are arranged two ends of the weld joint and then are cut off after welding, which is aimed to allow a top end and a tail end of a welded joint to obtain a weld joint section with a normal size and remove defects due to arc striking and ending; and 5) cleaning of a welding material, a welding wire and a welding agent for submerged-arc welding can greatly affect constituents, a structure and property of welding joint metal, so oxide skins, rust and oil stains must be cleared before welding; and wet must be prevented during preservation of the welding agent, and the welding agent must be dried at a designated temperature before use.

Description

A kind of submerged welding process

Technical field

The present invention relates to a kind of submerged welding process.

Background technology

The adjustment in processing step and device parameter etc. of the existing submerged welding process there is also certain empirical and technical, for the operator newly started with, in addition it is also necessary to carry out substantial amounts of exercise and could grasp operation skill, produces the good product of quality.

Summary of the invention

In order to realize the purpose of the present invention, the present invention provides the submerged welding process of a kind of easy to operate, quick, easy left-hand seat.

For solving above-mentioned technical problem, the present invention adopts the following technical scheme that

A kind of submerged welding process, including following operation:

1), prepare before weldering

Submerged-arc welding before welding must ready work, including the drying etc. of the retaining wall on slope of weldment, the removing surface at position to be welded, the assembling of weldment and the cleaning of welding wire surface, solder flux；

2), retaining wall on slope

Retaining wall on slope requires to perform by GB986 1988, to ensure that the root of weld occurs without lack of penetration or slag inclusion, and reduces filler metal amount；The processing of groove can use edge planer, mechanization or semi-mechanization gas cutting machine, carbon arc air gouging etc.；

3), the cleaning at position to be welded

Weldment cleaning mainly removes corrosion, greasy dirt and moisture, it is prevented that the generation of pore；General sandblasting, ball blasting method or manual removal, if desired with flame baking position to be welded；Before weldering should by groove and groove both sides each 20mm region and the surface rust at position to be welded, oxide skin, greasy dirt etc. clean out；

4), the assembling of weldment

Ensureing gap uniformity during assembling weldment, height is smooth, and unfitness of butt joint is little, and tack weld length is generally higher than 30mm, and tack weld quality is consistent with main weld prescription；Adopt special tooling, fixture if desired；Assembling to vertical masonry joint weldment, to install run-on tab and end tab additional at weld seam two ends, treats that postwelding slices off again, its objective is the section of weld joint making the top of welding point and end obtain normal size, but also can remove striking and the defect of ending easily appearance；

5), the cleaning of welding material

Welding wire used for submerged arc welding and the composition of solder flux Resistance of Weld Metal, tissue and performance impact are very big；Therefore the oxide skin of welding wire surface, rust and greasy dirt etc. must be removed before welding；It is noted that protection against the tide when solder flux preserves, must dry stand-by by the temperature of regulation before using.

The present invention is simple to operate, and operator's skill requirement is low, and product quality is high.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described:

A kind of submerged welding process, including following operation:

1), prepare before weldering

Submerged-arc welding before welding must ready work, including the drying etc. of the retaining wall on slope of weldment, the removing surface at position to be welded, the assembling of weldment and the cleaning of welding wire surface, solder flux；

2), retaining wall on slope

Retaining wall on slope requires to perform by GB986 1988, to ensure that the root of weld occurs without lack of penetration or slag inclusion, and reduces filler metal amount；The processing of groove can use edge planer, mechanization or semi-mechanization gas cutting machine, carbon arc air gouging etc.；

3), the cleaning at position to be welded

Weldment cleaning mainly removes corrosion, greasy dirt and moisture, it is prevented that the generation of pore；General sandblasting, ball blasting method or manual removal, if desired with flame baking position to be welded；Before weldering should by groove and groove both sides each 20mm region and the surface rust at position to be welded, oxide skin, greasy dirt etc. clean out；

4), the assembling of weldment

Ensureing gap uniformity during assembling weldment, height is smooth, and unfitness of butt joint is little, and tack weld length is generally higher than 30mm, and tack weld quality is consistent with main weld prescription；Adopt special tooling, fixture if desired；Assembling to vertical masonry joint weldment, to install run-on tab and end tab additional at weld seam two ends, treats that postwelding slices off again, its objective is the section of weld joint making the top of welding point and end obtain normal size, but also can remove striking and the defect of ending easily appearance；

5), the cleaning of welding material

Welding wire used for submerged arc welding and the composition of solder flux Resistance of Weld Metal, tissue and performance impact are very big；Therefore the oxide skin of welding wire surface, rust and greasy dirt etc. must be removed before welding；It is noted that protection against the tide when solder flux preserves, must dry stand-by by the temperature of regulation before using.

Claims (1)

1. a submerged welding process, is characterized in that: include following operation:

1), prepare before weldering

Submerged-arc welding before welding must ready work, including the drying etc. of the retaining wall on slope of weldment, the removing surface at position to be welded, the assembling of weldment and the cleaning of welding wire surface, solder flux；

2), retaining wall on slope

Retaining wall on slope requires to perform by GB986 1988, to ensure that the root of weld occurs without lack of penetration or slag inclusion, and reduces filler metal amount；The processing of groove can use edge planer, mechanization or semi-mechanization gas cutting machine, carbon arc air gouging etc.；

3), the cleaning at position to be welded

Weldment cleaning mainly removes corrosion, greasy dirt and moisture, it is prevented that the generation of pore；General sandblasting, ball blasting method or manual removal, if desired with flame baking position to be welded；Before weldering should by groove and groove both sides each 20mm region and the surface rust at position to be welded, oxide skin, greasy dirt etc. clean out；

4), the assembling of weldment

Ensureing gap uniformity during assembling weldment, height is smooth, and unfitness of butt joint is little, and tack weld length is generally higher than 30mm, and tack weld quality is consistent with main weld prescription；Adopt special tooling, fixture if desired；Assembling to vertical masonry joint weldment, to install run-on tab and end tab additional at weld seam two ends, treats that postwelding slices off again, its objective is the section of weld joint making the top of welding point and end obtain normal size, but also can remove striking and the defect of ending easily appearance；

5), the cleaning of welding material

Welding wire used for submerged arc welding and the composition of solder flux Resistance of Weld Metal, tissue and performance impact are very big；Therefore the oxide skin of welding wire surface, rust and greasy dirt etc. must be removed before welding；It is noted that protection against the tide when solder flux preserves, must dry stand-by by the temperature of regulation before using.