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双相不锈钢换热管与管板的焊接
Welding Duplex Stainless Steel Heat Exchange Tube to Tubesheet
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- DOI:
- 作者:
- 邢卓1，于志伟2，李科2
Xing Zhuo 1, Yu Zhiwei 2, Li Ke 2
- 作者单位:
- （1. 沈阳仪表科学研究院有限公司，辽宁沈阳110168；2. 大庆恒安评价检测有限公司，黑龙江大庆163458）
(1. Shenyang Academy of Instrumentation Science Co., Ltd., Shenyang 110168, China; 2. Daqing Heng'an Evaluation Detection Co., Ltd., Daqing 163458, China)
- 关键词:
- 双相不锈钢；换热管；焊接；铁素体
duplex stainless steel；heat exchange tube；welding；ferrite
- 摘要:
- 摘要：换热管与管板的焊接是换热器质量控制的重点。双相不锈钢焊接的目标是获得平衡的
铁素体（δ）和奥氏体（γ）。采用手工钨极氩弧焊，使用Φ1.6 mm 的ER2209 焊丝，以0.54 kJ/mm
的热输入焊接Φ25 mm×2 mm 的S32205 双相不锈钢换热管与管板试件。经取样检测，角焊缝
厚度均值2.88 mm；焊缝维氏硬度均值255.8 HV；按ASTM E562 测定铁素体含量，焊缝铁素体
含量均值59.3%，管侧熔合线57.3%，管侧热影响区58%，板侧熔合线58.7%，板侧热影响区
58.2%；按ASTM A923 的方法A 检测，5 区的金相组织相界和晶界平滑，无有害沉淀相析出，评
定为未受影响的金相组织；按GB/T 4334 的方法E 试验，无晶间腐蚀现象。以上各项检测指标
均符合相应标准和技术协议要求，说明焊接工艺适用。
Abstract: The welding of heat exchange tube and tubesheet is the key point of heat exchanger quality control. The goal of duplex
stainless steel welding is to obtain the balance of ferrite (δ) and austenite (γ). The S32205 heat exchange tube and tubesheet
specimens of Φ25 mm×2 mm were welded by manual TIG with Φ1.6 mm ER2209 and 0.54 kJ /mm heat input. After sampling and
testing, the average thickness of fillet weld is 2.88 mm; average vickers hardness of weld 255.8 HV; According to ASTM E562, the
average ferrite content of weld was 59.3%, tube side fusion line 57.3%, tube side HAZ 58%, plate side fusion line 58.7%, plate side
HAZ 58.2%. According to ASTM A923 method A test, the phase boundary and grain boundary of the five zones were smooth, no
harmful phase is precipitated, and assessed as unaffected metallographic structure. According to GB/T 4334 method E test, no
intergranular corrosion phenomenon. The above test indicators are in line with the corresponding standards and technical agreement
requirements, indicating that the welding process is applicable.