提高焊接接头疲劳性能的低相变点焊条焊趾熔修技术

LTTE WELD TOES DRESSING TECHNOLOGY TO IMPROVE FATIGUE BEHAVIOR OF WELDED JOINTS

在焊接接头疲劳试验的基础上,首次提出了用于提高焊接接头疲劳性能的低相变点焊条焊趾熔修技术。采用低相变点焊条LTTE和普通焊条E5015,分别对非承载十字接头和纵向环绕角焊缝接头实施焊趾熔修,进行疲劳性能对比,并与该两种形式接头的全LTTE焊缝接头疲劳性能进行比较。结果表明:相对于普通焊条E5015接头,低相变点焊条LTTE焊趾熔修技术可以有效地提高焊接接头的疲劳性能,其疲劳强度达到全LTTE焊缝接头的疲劳强度。这一技术降低了LTTE焊条的使用成本,为低相变点焊条在工程实践中的推广应用提供了一条有效途径。

On the basis of the fatigue tests of welded joints, a new method named LTTE(Low transformation temperature electrodes) weld toes dressing technology is first suggested to improve the fatigue performance of welded joints. No-load cruciform welded joints and longitudinal fillet welded joints, which are made of the base metal of Q235B and welded or dressed by both the developed LTTE and the conventional E5015, are selected to conduct fatigue test. The test results show that the LTTE-dressing technology can effectively improve the fatigue strengths of welded joints and the LTTE-dressing welded joints have the same improvement in fatigue strength as that of all-LTTE welded joints compared with those of welded joints welded with E5015. Its meanings in practice are that this way can reduce the LTTE costs in use and provide a valuable method for the application of the LTTE in practical welded structure widely.