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zoe122208

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superboy

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[求助] 谢谢帮忙翻译一段话

对内管不同厚度条件下的焊接接头进行拉伸试验，得到接头拉脱和母材断裂两种结果。当内管厚度小于临界厚度时，拉伸试验结果为接头拉脱，此时接头抗拉强度大于铝合金母材的抗拉强度。这是由于当内管厚度小于临界厚度时，外管高速撞击使得内管发生变形失稳，使得内、外管之间存在间隙导致焊接效果较差。当内管厚度达到临界厚度后，试验结果为母材断裂。表明，焊接接头的抗拉强度高于母材强度，焊接效果较好。
随着内管厚度的逐渐增加，接头焊合面积逐渐增大，当内管厚度达到临界壁厚时，焊接试样很难完全剥离开。对剥离试样连接部位进行SEM分析可知，当内管厚度未达到临界厚度时，内、外管间未形成碰撞过渡区，而当内管壁厚达到临界厚度时，两种金属连接部位产生过渡区，通过对过渡区线扫描分析可知，过渡区最宽处宽度达到40μm。在过渡区中心较宽的范围内，Al、Fe异种元素所占比例基本不变。Al元素含量略高，在过渡区两侧，两种元素在对方金属一侧含量迅速降低，可见当达到临界厚度时，焊接接头较为均匀。

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1楼 2013-11-22 13:03:28

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befair

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zoe122208: 金币+120, 翻译EPI+1, ★★★★★最佳答案 2013-11-22 20:22:48

Tension tests are performed on welding joints for different thickness of inner tubes and the two results are either break-up of the joints or fracture of the parent metal. When thickness of the inner tube is less than the critical value, the tension test will result in joints breaking up at which the tensional strength of the joint is smaller than that of the parent aluminum alloy. This is because when thickness of the inner tube is less than the critical value, the high speed impact by the outer tube will cause the inner tube to deform and become unstable, i.e., welding does not get effective due to the gap between inner and outer tubes. When thickness of the inner tube reaches the critical value, the test results in fracture of parent metal. This shows that the tensional strength of the joint is greater than that of the parent aluminum alloy, hence an effective welding.

With the gradual increase in thickness of the inner tube, the welded area of the joint increases, too and when thickness of the inner tube reaches the critical value, the weld sample can hardly completed stripped off. From SEM analysis of the joint on the stripped sample, it is found that when thickness of the inner tube has not yet reached the critical value, no impact and transition zone is formed between the inner and outer tubes; while when thickness of the inner tube reaches the critical value, a transition zone appears at the connection between the two types of metals. By line scanning analysis of this transition zone, it is seen that the maximum width of the transition zone reaches 40μm. In a wide range around the middle of this zone, proportions of Al and Fe elements remain basically unchanged. The Al element content is slightly higher and at either side of the transition zone, the elements' content at their dual side quickly decreases, which shows when the critical thickness is reached, the welding joint is uniform.
注：第二句中文里“此时接头抗拉强度大于铝合金母材的抗拉强度”应该是小于吧？不然逻辑上说不通，请检查。我是按小于译的。
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