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style="width:664px; overflow:hidden;">   <p>     通过前两ơ实验发现导致孔壁周围出现未熔合现象主要有以下几点原因:<br />   (1)PT、MT探伤无问题说明表面焊接质量良好,RT探伤不合D明底部焊接质量存在问题。分析知因ؓ孔的深比较大直径比较??12mm深、直?0mm)Q在焊接孔的底部时焊枪角度无法保证所_会导致在孔底部焊接时焊接I间不Q焊枪不能有效摆动.Q导致底部存在较多焊接缺陗?br />   (2)W二批试件底片显C的点状较第一批少说明焊接质量有所提高。说明增加工人操作实c采用有效的工艺Ҏ如预热、改变焊接姿ѝ退火,能够有效地减焊接缺P提高焊接质量。鉴于以上对试验l果的分析。对塞焊工艺q行优化如下Q对该处扩孔孔径q行了工_由原来的直径40mmQ扩大到直径60mmQ即减少孔的深宽比,增大焊枪的摆动空间鉴于扩孔尺寔R制。扩孔后孔壁变薄Ҏ产生变Ş需要进一步改q焊接结构。在塞焊孔中央增加垫板可以有效减孔的深度.工艺Ҏ为用与母材材质相同的材料Q加工成于孔径OQ?ram、厚?2mm的圆形垫片,垫片边缘加工?0。以上的坡口Q以工g的Ş式点焊置于母材孔的中间或偏中间。按照改q后的工艺方法进行了试验Q试验结果分析:从宏观上分析和比较:孔中间加垫,大大减少了塞焊的隑ֺ和劳动强度.提高了生产效率,降低了成本,保证了塞焊质量从断面腐蚀观察Q孔中间加垫Q焊接缺陷很,选择合理的焊接参敎ͼ孔垫和母材全部熔合.可以有效控制焊接q程中的~陷试glRT线探伤,发现完全没有~陷存在。试件完全符合焊接质量要求?br /> <br /></p><br> <p><div>上一?<a href="39.html">常州铝铸Mg加工的流E?/a></div> <div>下一?<a href="37.html">Mg加工注意事项</a></div> </p></div> <div class="tag">相关标签Q?/div><div class="tag">来源:<a href='http://www.aoderhcm.com/news/38.html'>http://www.aoderhcm.com/news/38.html</a></div> </div> </div> </div> <div class="clear"></div> <div 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