Steel plate submerged arc welding method
A welding method and submerged arc welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of low work efficiency and achieve the effect of improving work efficiency
Active Publication Date: 2020-08-28
HAIYANG CIMC RAFFLES OFFSHORE +2
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Problems solved by technology
[0004] The purpose of the present invention is to solve the technical problem that the submerged arc welding process in the prior art adopts small current bottom welding and needs to clean the root and polish the backside, resulting in low work efficiency, and to provide a steel plate submerged arc welding method
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[0029] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0030] see figure 1 , which is a flowchart of a steel plate submerged arc welding method provided by the present invention. Method of the present invention comprises the steps:
[0031] Step S1, the step of forming the welding groove. Before welding, a front V-shaped groove is formed on the front of the steel plate with a thickness of not less than 20mm, the opening of the front V-shaped groove faces upward, and the root gap of the front V-shaped groove 0-2mm, blunt edge length 3-8mm.
[0032] In one embodiment, such as figure 2 As shown, it is a schematic diagram of the front V-groove and weld bead arrangement structure of a steel plate with a thickness of 20-30 mm. The thickness H1 of the steel plate 11 to be welded is 20-30mm, a front V-shaped groove 12 i...
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Abstract
The invention discloses a submerged-arc welding method for a steel plate. The method comprises the following steps: a forming step of a welding groove: forming a front V-shaped groove in the front surface of the steel plate, the thickness of which is not smaller than 20mm, wherein the opening of the front V-shaped groove is upward, the root gap of the front V-shaped groove is 0-2mm, and the lengthof a truncated edge is 3-8mm; a front welding step: setting the welding process parameters of front welding as follows: the welding current is 600-650A, the welding voltage is 28-30V, the welding speed is 40-50cm / min and the extension length of a welding stick is 25-30cm, and carrying out front submerged-arc welding according to the set welding process parameters, wherein the root of the front V-shaped groove is not welded through for the front welding; and a first back bead welding step: setting the welding process parameters of a first back bead as follows: the welding current is 720-780A,the welding voltage is 30-33V, the welding speed is 40-50cm / min, and the extension length of a welding stick is 25-30cm, and carrying out back submerged-arc welding according to the set welding process parameters. According to the method disclosed by the invention, the welding efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of marine engineering equipment welding, in particular to a submerged arc welding method for steel plates used in the construction process of marine engineering equipment. Background technique [0002] At present, marine engineering equipment is gradually developing towards large-scale to adapt to the harsh marine working environment. Therefore, ultra-high-strength, large-thickness and medium-thickness steel plates are usually required to build large-scale marine engineering equipment to meet the strength and rigidity of large-scale marine engineering equipment. , stability and impact performance requirements. [0003] In order to make the impact performance of the welded joint meet the specification requirements at -60°C, the existing submerged arc welding welding process used in the construction of marine engineering equipment is generally: Current for fast welding, secondly, front side welding, and third...
Claims
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IPC IPC(8): B23K9/18B23K9/235
CPCB23K9/18B23K9/235
Inventor 马向阳刘洪丹李永旺蔡峰李忠宁朴方昊
Owner HAIYANG CIMC RAFFLES OFFSHORE