Non-back-gouging method for medium-thickness plate in submerged-arc welding
A root method and submerged arc welding technology, which is applied in the field of large-scale air separation manufacturing welding, can solve the problems of employees' occupational health damage, time-consuming, and high-intensity employees.
Inactive Publication Date: 2018-10-30
HANGZHOU HANGYANG
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Problems solved by technology
[0003] The existing submerged arc welding welding methods all need carbon arc gouging process to clean the root. The carbon arc gouging process also has occupational health damage to employees. During the operation, employees are easy to inhale carbon powder and metal dust, etc. Harmful substances, although wearing a mask, it is still impossible to completely avoid harmful substances from harming employees
In addition, the workload of carbon arc gouging is very large, the work intensity of employees is high, and it consumes a lot of time. The time of carbon arc gouging for one weld is equivalent to the time for welding one weld.
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Embodiment
[0012] Embodiment: The present invention is mainly aimed at the new welding process of submerged arc welding of ferrous metals such as carbon steel and stainless steel, including welding groove, welding parameters and operation mode. The diameter of the welding wire used in this new process is 5mm or 4mm, and the welding wire can be copper-coated or not. The thickness of the plate can cover 8mm-25mm, and the material of the plate is carbon steel or stainless steel; it can realize submerged arc welding within the thickness range and directly weld the cover layer without cleaning the root and back; the weld performance has passed RT non-destructive testing, and more than 99% I The qualification rate of the grade sheet and the mechanical properties meet the mechanical property requirements of the energy standard NB / T47014 process evaluation. Improve production efficiency while ensuring welding quality.
[0013] The welding groove described in the present invention is an X-shaped...
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Abstract
The invention discloses a non-back-gouging method for a medium-thickness plate in submerged-arc welding. The plate thickness of the medium-thickness plate is 8-25mm, and an X-shaped welding groove isformed in the medium-thickness plate. The non-back-gouging method comprises the following steps: welding a front-surface groove of the X-shaped welding groove to form a full welding joint with a reinforcement of 0-2mm at first; and then welding a back-surface groove of the X-shaped welding groove to form a full welding joint with a reinforcement of 0-2mm, wherein welding wires with diameters of 5mm or 4mm are used during welding, the adjustment range of a welding current is 400-800A, the adjustment range of a welding voltage is 20-45V, and the adjustment range of a welding speed is 200mm / min-700mm / min. The non-back-gouging method is capable of realizing submerged-arc welding for a black material, and increasing the production efficiency while ensuring the welding quality; and the non-back-gouging method has the characteristics of being simple to operate, high in working efficiency, good in working environment and the like.
Description
technical field [0001] The present invention relates to a method of submerged arc welding medium and thick plates without root cleaning, in particular to a carbon steel material or stainless steel material air separation pressure vessel cylinder straight seam and circular seam submerged arc welding welding method, which belongs to large-scale air separation manufacturing The field of welding technology. Background technique [0002] The cylinder material of the air separation pressure vessel is divided into colored material and black material, and the black material is mainly divided into two categories: carbon steel and stainless steel. Due to the high inspection requirements of the air separation pressure vessel, the weld seam needs 100% non-destructive inspection and is not allowed. Pores, cracks, slag inclusions and other defects, so after the front side of the weld is welded, the back side needs to go through the carbon arc gouging process to remove potential defect...
Claims
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Login to View More IPC IPC(8): B23K9/18B23K9/095
CPCB23K9/095B23K9/18
Inventor 杨红亮郑剑兴俞珏涵
Owner HANGZHOU HANGYANG