The welding process used for submerged arc welded straight seam steel pipe is submerged arc welding technology, which adopts filler welding and particle protection flux submerged arc. The diameter of production can reach 1500mm. LSAW is the English abbreviation of submerged arc welded straight seam steel pipe. The production process of submerged arc welded straight seam steel pipe includes JCOE forming technology and coil forming submerged arc welding technology. When the diameter is large, two steel plates may be used for rolling, which will form the phenomenon of double welds.
Requirements for welding temperature of straight seam steel pipe:
材質為低碳鋼，焊接溫度控制在1250~1460℃，可滿足3~5mm管壁厚的焊透要求，焊接溫度主要通過調節高頻渦流熱功率和焊接速度來控制。The material is low carbon steel, and the welding temperature is controlled at 1250~1460℃, which can meet the penetration requirements of 3~5mm tube wall thickness. The welding temperature is mainly controlled by adjusting the high-frequency eddy current thermal power and welding speed.
當輸入熱量不足時，受熱焊縫邊緣達不到焊接溫度，金屬組織保持固态，導緻未熔合或未焊透。當輸入熱量過大時，受熱焊縫邊緣超過焊接溫度，産生過燒或熔滴，使焊縫形成熔洞。When the input heat is insufficient, the edge of the heated weld cannot reach the welding temperature, and the metal structure remains solid, resulting in incomplete fusion or incomplete penetration. When the input heat is too large, the edge of the heated weld exceeds the welding temperature, resulting in overburning or molten droplets, causing the weld to form a hole.
The production characteristics of submerged arc welded straight seam steel pipe can eliminate the cause of weld slag inclusion due to unclean interlayer during multi-layer welding.
針對原材料中夾雜物較多而使焊縫産生夾渣，采取焊前檢驗母材、換新焊絲和焊劑等措施後，焊縫熔合線夾渣産生的比例僅略有減少，說明原材料中的夾雜物不是導緻夾渣産生的主要原因。In view of the fact that there are many inclusions in the raw materials and the slag inclusion in the weld, after taking measures such as inspection of the base metal before welding, replacement of welding wire and flux, etc., the proportion of slag inclusion in the fusion line of the weld is only slightly reduced, indicating that inclusions in the raw materials. It is not the main cause of slag inclusions.
Therefore, the main reason for the fusion line slag inclusion in the thick-walled straight seam submerged arc welded steel pipe is the improper selection of welding process parameters. The welding process parameters of the thick-walled LSAW steel pipe mainly include: line energy, welding current, welding voltage, welding speed, welding wire spacing, groove size, etc.
夾渣是殘留在焊縫内部的熔渣。從理論上分析，埋弧自動焊焊縫産生夾渣的原因主要有以下3點： Slag inclusions are slag that remains inside the weld. Theoretically, the main reasons for slag inclusion in submerged arc automatic welding seams are as follows: ①原材料(包括母材、焊絲、焊劑)中夾雜物較多； ①There are many inclusions in raw materials (including base metal, welding wire, flux); ②多層焊時層間清理不幹淨； ②The cleaning between layers is not clean during multi-layer welding; ③選用的焊接工藝參數不當，不利于熔渣的浮出。 ③ The selected welding process parameters are inappropriate, which is not conducive to the emergence of slag.,更多精彩资讯请关注tft每日頭條，我们将持续为您更新最新资讯!
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