An outfield welding process for liquefied gas ships
A technology of welding process and liquefied gas ship, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of long residence time, concave weld seam, excessive current, etc., so as to improve welding quality and avoid welding seam The effect of pores or interlayers
Active Publication Date: 2021-09-03
上海江南船舶管业有限公司
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Problems solved by technology
Most of the defects reflected on the film have concave defects. In view of the problems in this aspect, after the analysis of our construction personnel and my experience in daily work, the following reasons are summarized: The current at the position is too large and the residence time is long, causing the weld seam to appear concave at this position
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[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0039] An outfield welding process for liquefied gas ships, with reference to figure 1 and figure 2 , including the following steps:
[0040] S1, surround the welding area with three yellow cloths to form a relatively closed space to prevent the entry of side winds, causing a large amount of air to enter the molten pool during the welding process to form pores;
[0041] When bottom welding at 5-7 o'clock, arc breaking operation method is adopted. The main operation method is: the welding torch starts welding from the direction of 6 o'clock, stays for 2-3 seconds, and the arc swings slightly left and right;
[0042] S2, after a penetrating molten pool is formed, quickly add 1-2 drops of welding wire to the molten pool to increase the surface tension of the molten pool;
[0043] S3, use the arc thrust to make the reverse side well formed;
[0044] S4, quic...
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Abstract
The invention discloses an outfield welding process for a liquefied gas ship, which relates to the field of welding technology, and comprises the following steps: S1, during bottom welding at the 5-7 o'clock position, the welding torch starts welding from the 6 o'clock direction and stays for 2-3 seconds, The arc swings slightly left and right; S2, after forming a penetrating molten pool, quickly add 1-2 drops of welding wire to the molten pool; S3, use the thrust of the arc to make the reverse side well formed; S4, form in the first molten pool After that, the arc is quickly broken for 0.5±0.15 seconds, and the heat of the weld is controlled below the melting temperature of the molten pool; S5, the arc is started immediately before the molten pool is completely cooled, and the second molten pool is welded. Aiming at the problem in the prior art that there are concave defects in the weld seam in the back welding, the purpose of the present invention is to provide an outfield welding process for a liquefied gas ship, which can effectively avoid the concave defects in the weld seam in the back welding.
Description
technical field [0001] The invention relates to the field of welding technology, more specifically, it relates to an outfield welding process for a liquefied gas ship. Background technique [0002] With the development of the economy, the demand for energy is increasing day by day, and liquefied gas ships have been widely used. Due to the particularity and danger of the medium loaded on liquefied gas ships, higher requirements are put forward for product materials and welding quality. The material of the liquefaction pipeline system is O0Cr17Ni14Mo2, which has the characteristics of plasticity, toughness, weldability and corrosion resistance that are superior to other stainless steel materials. The welding material is 316L, and the welding quality requirements are 100% first-class non-destructive testing. However, difficulties have been encountered in the actual production process of the 16000m³ liquefied gas carrier. [0003] Due to the poor working environment in the fie...
Claims
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IPC IPC(8): B23K9/02
CPCB23K9/02
Inventor 冯旭东
Owner 上海江南船舶管业有限公司