焊管
銲管
한관
WELDED PIPE AND TUBE
2014年
4期
62-67
,共6页
埋弧焊管%导向弯曲试验%伸长率%应变%标距%微裂纹
埋弧銲管%導嚮彎麯試驗%伸長率%應變%標距%微裂紋
매호한관%도향만곡시험%신장솔%응변%표거%미렬문
SAW pipe%guided bend test%elongation%strain%gauge length%microcrack
对埋弧焊管的导向弯曲试验进行了理论分析，得到其应变公式，并计算了最大应变。将不同试样尺寸下钢材的断后伸长率，按Oliver公式换算到同一个标准条件下进行了比较。建立了弯曲应变判断公式来分析弯曲不合的基本原因。通过实际测量方法对弯曲试样的母材、热影响区和焊缝的应变进行了测量和分析，认为焊接接头的塑性一般足以满足导向弯曲试验要求。通过分析弯曲不合钢管酸洗样的显微照片，认为焊趾微裂纹是弯曲不合的主要原因。
對埋弧銲管的導嚮彎麯試驗進行瞭理論分析，得到其應變公式，併計算瞭最大應變。將不同試樣呎吋下鋼材的斷後伸長率，按Oliver公式換算到同一箇標準條件下進行瞭比較。建立瞭彎麯應變判斷公式來分析彎麯不閤的基本原因。通過實際測量方法對彎麯試樣的母材、熱影響區和銲縫的應變進行瞭測量和分析，認為銲接接頭的塑性一般足以滿足導嚮彎麯試驗要求。通過分析彎麯不閤鋼管痠洗樣的顯微照片，認為銲趾微裂紋是彎麯不閤的主要原因。
대매호한관적도향만곡시험진행료이론분석，득도기응변공식，병계산료최대응변。장불동시양척촌하강재적단후신장솔，안Oliver공식환산도동일개표준조건하진행료비교。건립료만곡응변판단공식래분석만곡불합적기본원인。통과실제측량방법대만곡시양적모재、열영향구화한봉적응변진행료측량화분석，인위한접접두적소성일반족이만족도향만곡시험요구。통과분석만곡불합강관산세양적현미조편，인위한지미렬문시만곡불합적주요원인。
In this article, the theoretical analysis of SAW pipe guided bend test was carried out, its strain formula was obtained, and the maximum strain was calculated. The percentage elongations after fracture of steel material under different sample size were compared, according to Oliver formula conversion to the same standard condition. It established a bend strain judging formula to find the basic reason of bend failure. By the method of actual measurement, the strain on bend specimens of parent metal, heat affected zone and weld was measured and analyzed, the result showed that the plasticity of welded jointer enough to meet the requirements of guided bend test. Through analyzing the micrograph of pickling sample of bend disqualified pipe, it considers that the microcrack in weld toe is the main reason of the bend disqualified test.
