鐵藝大門作為建筑裝飾與安全防護的結合體，其焊接工藝直接影響結構強度與美學呈現。從材料預處理到成品檢驗，每個環節都需遵循嚴格的技術規范。

　　As a combination of architectural decoration and safety protection, the welding process of wrought iron gates directly affects the structural strength and aesthetic presentation. From material pretreatment to finished product inspection, strict technical specifications must be followed at every stage.

　　焊接材料匹配性是首要準則。母材需選用S235JR或Q235B等低碳結構鋼，碳當量控制在0.4%以下，確保焊接熱影響區韌性。焊材應與母材力學性能匹配，手工電弧焊推薦使用E43系列焊條，氣體保護焊則選用ER50-6實心焊絲。對于裝飾性鑄件與型材的異種鋼連接，需采用過渡層焊接工藝，通過預置鎳基焊材解決碳遷移問題。

　　The compatibility of welding materials is the primary criterion. The base material should be low-carbon structural steel such as S235JR or Q235B, with a carbon equivalent controlled below 0.4% to ensure the toughness of the welding heat affected zone. The welding material should match the mechanical properties of the base material. E43 series welding rods are recommended for manual arc welding, while ER50-6 solid welding wire is used for gas shielded welding. For the dissimilar steel connection between decorative castings and profiles, a transition layer welding process is required to solve the carbon migration problem by pre setting nickel based welding materials.

　　坡口制備精度決定熔透質量。對于厚度超過6毫米的板材，需采用機械加工方式制備V型或X型坡口，坡口角度控制在60°±5°，鈍邊高度不超過2毫米。組裝間隙應嚴格控制在1-3毫米范圍內，通過專用夾具實現精準定位，避免強制裝配導致的殘余應力。

　　The accuracy of groove preparation determines the quality of fusion. For plates with a thickness exceeding 6 millimeters, V-shaped or X-shaped grooves need to be prepared by mechanical processing, with a groove angle controlled at 60 °± 5 ° and a blunt edge height not exceeding 2 millimeters. The assembly gap should be strictly controlled within the range of 1-3 millimeters, and precise positioning should be achieved through specialized fixtures to avoid residual stress caused by forced assembly.

　　焊接工藝參數需量化控制。手工電弧焊時，平焊位置電流控制在120-160A，電壓22-24V，焊接速度15-20厘米/分鐘。氣體保護焊則采用短路過渡模式，電流180-220A，電壓18-20V，送絲速度5-7米/分鐘。多層多道焊時，層間溫度需控制在150℃以下，采用紅外測溫儀實時監控，防止晶粒粗化。

　　Welding process parameters need to be quantitatively controlled. When performing manual arc welding, the current at the flat welding position should be controlled at 120-160A, the voltage should be 22-24V, and the welding speed should be 15-20 centimeters per minute. Gas shielded welding adopts a short-circuit transition mode, with a current of 180-220A, a voltage of 18-20V, and a wire feeding speed of 5-7 meters per minute. During multi-layer and multi pass welding, the interlayer temperature should be controlled below 150 ℃, and an infrared thermometer should be used for real-time monitoring to prevent grain coarsening.

　　變形控制貫穿整個工藝流程。采用對稱施焊原則，對長度超過2米的構件實施分段退焊法，每段長度控制在300-500毫米。對于復雜結構，預先進行焊接變形數值模擬，通過彈性反變形工裝抵消角變形。焊后立即進行機械矯正或火焰矯正，矯正溫度不超過650℃，避免藍脆現象。

　　Deformation control runs through the entire process flow. Adopting the principle of symmetrical welding, the segmented back welding method is implemented for components with a length exceeding 2 meters, with each segment length controlled between 300-500 millimeters. For complex structures, numerical simulation of welding deformation is carried out in advance, and angular deformation is offset by elastic anti deformation fixtures. Immediately perform mechanical or flame correction after welding, with a correction temperature not exceeding 650 ℃, to avoid blue brittleness.

　　質量檢驗體系包含多重關卡。外觀檢測執行ISO 5817 B級標準，焊縫余高控制在0-3毫米，咬邊深度不超過0.5毫米。無損檢測采用PT滲透檢測與UT超聲檢測組合，對角焊縫實施100%磁粉探傷，確保裂紋、未熔合等缺陷檢出率。力學性能試驗需制作標準試樣，抗拉強度不低于母材的90%，-20℃沖擊功≥27J。

　　The quality inspection system includes multiple checkpoints. The appearance inspection shall comply with the ISO 5817 B-level standard, with the weld seam height controlled at 0-3 millimeters and the undercut depth not exceeding 0.5 millimeters. Non destructive testing adopts a combination of PT penetration testing and UT ultrasonic testing, and 100% magnetic particle inspection is carried out on diagonal welds to ensure the detection rate of defects such as cracks and incomplete fusion. Mechanical performance tests require the production of standard specimens with a tensile strength not less than 90% of the base material and an impact energy of ≥ 27J at -20 ℃.

　　特殊環境需專項處理。沿海區域產品需進行焊縫區域鍍鋅層修復，采用富鋅底漆加氟碳面漆的防護體系，鹽霧試驗≥1000小時。對于裝飾性鏤空圖案，需制定專項焊接順序，通過跳焊法控制熱輸入，確保0.5毫米間距的鐵藝花紋不變形。

　　Special environments require special treatment. Coastal products need to undergo galvanized layer repair in the weld area, using a protective system of zinc rich primer and fluorocarbon topcoat, with a salt spray test of ≥ 1000 hours. For decorative hollow patterns, a special welding sequence needs to be developed to control heat input through skip welding, ensuring that the iron patterns with a spacing of 0.5 millimeters do not deform.

　　鐵藝大門焊接是材料科學、熱力學與結構力學的綜合應用。從焊前坡口處理到焊后應力消除，每個技術參數都需精確量化。通過建立工藝參數數據庫與質量追溯系統，可實現焊接質量的穩定控制，使鐵藝大門在承載安全功能的同時，完美呈現藝術造型的視覺張力。

　　Iron gate welding is a comprehensive application of materials science, thermodynamics, and structural mechanics. From pre weld groove treatment to post weld stress relief, each technical parameter needs to be accurately quantified. By establishing a process parameter database and quality traceability system, stable control of welding quality can be achieved, allowing the wrought iron gate to perfectly present the visual tension of artistic form while carrying safety functions.

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