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<\/p>\n1. The steel plates of the hull have become distorted during welding; do you know how to control and correct this? The steel plates of the hull have become distorted during welding; are you clear on how to control and correct this? The abstract points out that the hull\u2019s steel plates are prone to deformation during the welding process, and that this deformation is complex in nature; it currently represents a technical challenge within the welding sector both domestically and internationally. The issue of welding distortion profoundly affects welding quality; only by conducting a rational and scientific analysis of this phenomenon and identifying methods to control the distortion can this technical challenge be resolved. This paper focuses on common types of welding distortion in ship hull steel plate welding, the main causes of such distortion, and the relevant principles for controlling it. It also covers methods for correcting welding distortion, thereby enabling the effective resolution of the problem of steel plate deformation. Keywords: marine steel plates; welding distortion; Control and Correction Introduction: During the shipbuilding process, deformation of welded joints has a significant impact on their performance, leading to a decline in the strength and toughness of hull components, which ultimately affects the quality of the vessel\u2019s construction. Given that ship hull structures are characterised by their large dimensions and complex shapes,<\/p>\n
2. Consequently, it is not straightforward to address this issue through measures based on a single approach; it is therefore essential to analyse the causes of welding distortion, as well as the various factors that influence its effects and the final outcome. Different methods must be adopted in accordance with the specific characteristics of each stage of the shipbuilding process, with the ultimate aim of minimising distortion. 1 Classification of Welding Distortion: The longitudinal shortening of structural dimensions caused by longitudinal contraction of the weld is referred to as longitudinal contraction distortion. The extent of longitudinal contraction of a weld generally increases with the length of the weld; this type of distortion is caused by contraction along the direction of the weld and includes phenomena such as longitudinal contraction and longitudinal bending. Transverse distortion occurring after welding is primarily manifested as transverse shortening. The thicker the steel plate, the greater the transverse contraction; for plates of the same thickness, the larger the groove angle, the greater the transverse contraction. Transverse deformation results from contraction perpendicular to the direction of the weld and includes transverse contraction and angular deformation, amongst others. Wavy deformation occurs primarily in welded structures made of thin plates. It is mainly caused by the pressure exerted by the longitudinal contraction of the weld on the edges of the steel plate; when this pressure exceeds a certain value, the plate will exhibit wavy deformation. There is also another type.<\/p>\n
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3. Angular distortion is caused by uneven transverse contraction of fillet welds; the twisting that occurs in a component after welding is referred to as torsional distortion. This can result from inappropriate positioning of the component, poor assembly quality, and non-compliant welding orientation. Factors such as the linear expansion coefficient of the welding materials, the welding method, welding parameters and the welding direction can all contribute to distortion in ship hull welding. Whilst ensuring full penetration, it is advisable to select a lower heat input wherever possible.Welding process<\/a>Parameters. The factors affecting welding distortion do not act in isolation; rather, they interact to produce a combined effect resulting in overall changes. 2. Welding methods and process parameters should be selected to allow the weld to contract freely as far as possible, in order to minimise the impact of stress on large welded structures. Welding should be carried out symmetrically from the centre outwards, with welds exhibiting greater contraction being welded first. Butt welds exhibit greater contraction than fillet welds; therefore, when both types of weld are present in the same structure, butt welds should be welded first wherever possible. Depending on the specific circumstances of the welded structure, process parameters should be set as low as practicable.<\/p>\n 4. Welding speed: If small-diameter electrodes and a low welding current are used, the welding speed should be increased; if the welding current is high, the welding speed must also be increased. This reduces the heat-affected zone of the workpiece, thereby minimising welding stresses and distortion. 2.2 Position of the welds within the structure: Asymmetry in the layout of welds within a structure is a major factor causing bending deformation. In complex ship hull welded components, where numerous welds exist above and below the neutral axis at varying distances from it, bending deformation is highly likely to occur. Therefore, welds should be distributed as symmetrically as possible about the neutral axis of the midship section, avoiding placement in directions prone to deformation or at points of stress concentration. The further a weld is from the neutral axis, the greater the torque exerted on the neutral axis by the welding contraction forces, and consequently, the greater the bending deformation caused by welding. Consequently, welds should be positioned on the neutral axis or as close to it as possible, in order to minimise bending deformation. 2.3 Assembly and Welding Procedures The degree of rigidity of a metal structure is a factor influencing deformation; structures with greater rigidity are less prone to deformation after welding, whereas those with lower rigidity are more susceptible.<\/p>\n 5. After welding, deformation is highly likely to occur. A reasonable assembly and welding sequence is a key factor in minimising welding deformation. The sequence of first assembling the components into a complete unit and then carrying out the welding work is logical and helps to minimise the amount of deformation. The assembly and welding sequence can alter the rigidity of the components and shift the centre of gravity, which has a significant impact on the control of distortion. Therefore, in terms of the overall structure, there are two approaches to choose from: welding whilst assembling, or assembling the structure into a complete unit before welding. For simple structures, adopting the latter approach can reduce bending distortion. 3. Principles and methods for controlling hull welding distortion: the rigidity conditions during the welding process and thermal distortion are the primary factors influencing distortion. Measures to control residual deformation should be taken from both structural design and construction process perspectives. When applying these to hull structure design, shipyards have summarised numerous measures derived from production practice to achieve the objective of controlling hull welding deformation, such as arranging welds symmetrically, reducing the size and length of welds whilst ensuring sufficient strength, and utilising simple jigs and fixtures during assembly and welding. Full stop. Regarding the content following the word \u2018implementation\u2019: Your previous statement is incomplete. If there is anything further you wish to add, please express it coherently and in full so that I may rewrite it accurately in accordance with the regulations.<\/p>\n 6. 1) During hull assembly, work must be carried out in the absence of applied stresses; 2) Submerged arc welding and gas shielded welding processes must be employed; 3) Welding parameters and the welding sequence must be selected appropriately; this is essential in terms of welding procedures for controlling deformation during hull welding. Welding is one of the key processes in hull construction. An appropriate welding process is an effective means of reducing welding distortion and minimising stress concentration. Wherever possible, the rigid clamping method and the pre-distortion method should be employed in the welding process. These are the fundamental methods used to control welding distortion. A method commonly employed in shipyard construction to control distortion is the rigid clamping method, which involves securing components to a platform of sufficient rigidity and removing the clamps only once all welds in the welded components have cooled to room temperature. Shipyards make extensive use of various forms of rigid clamping during the production process, such as adding shims when butt-welding steel plates or applying pressure plates when butt-welding thin plates. Another method is pre-deformation, which involves artificially shaping the workpiece in advance based on the deformation that may occur after welding.<\/p>\n 7. This creates a deformation of equal magnitude but in the opposite direction, resulting in minimal, or even no, post-weld distortion of the workpiece; Such methods\u2014such as incorporating a counter-deformation allowance in advance during layout, where the magnitude of the counter-deformation is determined empirically\u2014have found widespread application in welding production. Provided the counter-deformation value is appropriately selected, a relatively satisfactory shape can be achieved. 4. Control and Correction of Welding Distortion In shipbuilding, although measures taken at the structural design and construction process levels can help control distortion, given the inherent characteristics of welding, the occurrence of distortion is inevitable. Distortion exceeding the specified standards must therefore be corrected. Straightening processes are limited to correcting localised deformation in welded components; deformation affecting the ship\u2019s hull structure as a whole can only be compensated for by means of pre-allowed allowance. There are two methods for correcting deformation caused by welding: mechanical straightening and flame straightening. Mechanical straightening utilises mechanical force to correct deformation in structures resulting from welding; typically, a press or levelling machine is used. Mechanical straightening can only be applied to materials with good plasticity. The flame straightening method involves the concentrated heating of the metal in the elongated sections of the deformed component using a flame. Upon cooling, the metal in the welded section undergoes irreversible plastic deformation, thereby correcting the overall deformation. Caution must be exercised when applying the flame straightening method to materials with poor plasticity. The flame temperature must be carefully controlled; if the temperature is too high, the mechanical properties of the material will deteriorate, whilst if the temperature is too low, the efficiency of the straightening process will be reduced. The cooling rate has no effect on the straightening outcome; therefore, shipyards generally employ a method of heating whilst simultaneously spraying water to enhance efficiency. 5 Conclusion In summary, during the shipbuilding process, weldingdeformation control<\/a>This technique presents one of the technical challenges in the field of welding. Welding distortion is influenced by factors such as the materials and welding processes; it is only by controlling this distortion and correcting it that the strength and performance requirements of ships can be met. This article is sourced from the internet and is intended solely for personal study and reference.<\/p>","protected":false},"excerpt":{"rendered":" Deformation occurs during the welding of ship hull plates \u2013 do you know how to control and correct it? Deformation occurs during the welding of ship hull plates \u2013 do you know how to control and correct it? Abstract: Ship hull plates are prone to deformation during the welding process, and this deformation is complex in nature; it currently represents a technical challenge in the field of welding both domestically and internationally.<\/p>","protected":false},"author":1,"featured_media":2500,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[56,1717,55,687,1716],"class_list":["post-2499","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-25","tag-56","tag-1717","tag-55","tag-687","tag-1716"],"_links":{"self":[{"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/posts\/2499","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/comments?post=2499"}],"version-history":[{"count":0,"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/posts\/2499\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/media\/2500"}],"wp:attachment":[{"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/media?parent=2499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/categories?post=2499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cndlfh.com\/en\/wp-json\/wp\/v2\/tags?post=2499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\u5982\u4f55\u63a7\u5236\u8239\u4f53\u8584\u677f\u94c6\u710a\u7684\u53d8\u5f62_\u8239\u4f53\u94a2\u677f\u710a\u63a5\u53d8\u5f62\u539f\u56e0\u53ca\u5f71\u54cd\u56e0\u7d20_\u8239\u4f53\u94a2\u677f\u710a\u63a5\u53d8\u5f62\u63a7\u5236\u77eb\u6b63\"](\"\/wp-content\/uploads\/2026\/08\/1786443149518_1.jpg\")
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