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螺旋焊管焊接区一般会存在什么问题

文章出处:   发布时间:2018-09-12 12:48:51   浏览:41

埋弧焊焊接区易产生的缺陷有气孔、热裂纹、和咬边等。1、气泡。气泡多发生在焊道中央,其主要原因是氢气依旧以气泡的形式隐藏在焊缝金属内部,所以,消除这种缺陷的措施是首先必须清除焊丝和焊缝的锈、油、水分及湿气等物质,其次是必须很好地烘干焊剂除去湿气。此外,加大电流、降低焊接速度、减慢熔化金属的凝固速度也是很有效的。

The defects easily produced in submerged arc welding zone include air holes, hot cracks, and undercutting. 1. Bubbles. Bubbles often occur in the center of the weld. The main reason is that hydrogen is still hidden in the weld metal in the form of bubbles. Therefore, to eliminate this defect, the first step is to remove rust, oil, moisture and moisture from the wire and weld, and the second step is to dry the flux well to remove moisture. In addition, increasing the current, decreasing the welding speed and slowing down the solidification speed of molten metal are also very effective.

2、硫裂(硫引起的裂纹)。焊接硫偏析带很强的板材(特别是软沸腾钢)时硫偏析带中的硫化物进入焊缝金属而产生的裂纹。其原因是在硫偏析带中含有低熔点的硫化铁和钢中存在氢气。所以,为防止这情况产生,使用含硫偏析带少的半镇静钢或镇静钢还明效的。其次,焊缝表面和焊剂的清洁与干燥也是很必要的。

2, sulfur cracking (sulfur induced cracks). Cracks occur when sulfide in the sulfur segregation zone enters the weld metal when the plate with strong sulfur segregation zone (especially soft boiling steel) is welded. The reason is that hydrogen exists in sulphide segregation zone and iron with low melting point.  Therefore, in order to prevent this situation, the use of sulfur segregation band less semi-killed steel or killed steel is also effective. Secondly, it is necessary to clean and dry the surface and flux of the weld.

3、热裂纹。在埋弧焊接中,焊道内可产生热裂纹,特别是在起弧和熄弧弧坑处容易发生裂纹。为消除这种裂纹,通常在起弧和熄弧处装有垫板,并在板卷对焊接结束时,可将螺旋焊管逆转而将焊进叠焊。热裂纹在焊缝应力很大的时候,或者焊缝金属内的si很高的时候最容易产生。

3. Hot crack. In submerged arc welding, hot cracks can occur in weld beads, especially in arc initiation and extinguishing pits. To eliminate this crack, a backing plate is usually installed at the arc initiation and arc extinguishing points, and the spiral welded pipe can be reversed and welded into the overlay welding at the end of the coil butt welding. Hot cracks are most likely to occur when the weld stress is high, or when the silicon in the weld metal is high.

4、焊渣的卷入。卷入焊渣就是在焊缝金属中残存一部分焊渣。

4. Welding slag involvement. Involved in welding slag is residual welding slag in the weld metal.

5、焊透度不佳。内外焊缝金属重叠度不够,有时未焊透。这种情况叫做焊透度不足。

5. Poor penetration. The overlap of inner and outer weld metal is not enough, sometimes it is not penetrated. This is called inadequate penetration.

6、咬边。咬边是沿着焊缝中心线在焊缝边部出现V形沟槽。咬边是在焊速、电流、电压等条件不适当的情况下产生的。其中焊接速度太高要比电流不适合更容易引起咬边缺陷。

6, bite the edge. The undercut is a V groove along the weld centerline at the weld edge. Undercut is caused by improper welding speed, current and voltage. The welding speed is too high, which is more likely to cause undercut defects than unsuitable current.

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