Liquefied gas carrier external field welding process
A technology of welding process and liquefied gas ship, which is applied in the direction of welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of concave weld seam, long residence time, excessive current, etc., and achieve the effect of welding process guarantee
Active Publication Date: 2020-04-21
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 a liquefied gas carrier external field welding process, and relates to the technical field of welding. The liquefied gas carrier external field welding process comprises the steps that S1, during backing welding at a 5-7 o'clock position, a welding gun starts welding from a 6 o'clock direction and stays for 2-3 seconds, and the arc slightly swings left and right; S2, aftera penetrating molten pool is formed, 1-2 drops of welding wire are rapidly added into the molten pool; S3, under the action of arc thrust, the reverse side is well formed; S4, after the first molten pool is formed, arc breaking is conducted rapidly for 0.5+ / -0.15s, and the heat of a weld joint is controlled to be below the melting temperature of the molten pool; and S5, arcing is conducted immediately before the molten pool is not completely cooled, and the welding of a second molten pool is conducted. In order to solve the problem that the weld joint has an inward concave defect in backing welding in the prior art, the invention aims to provide the liquefied gas carrier external field welding process, and the inward concave defect of the weld joint in backing welding is effectively avoided.
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-level non-destructive testing, but at 16000 Difficulties have been encountered in the actual production of liquefied gas carriers. [0003] Due to the poor working environment in the field and the di...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B23K9/02
CPCB23K9/02
Inventor 冯旭东
Owner 上海江南船舶管业有限公司