GH3030高温合金激光填粉焊接工艺及性能研究

Study on Technology and Properties of GH3030 Superalloy by Laser Powder-filling Welding

激光填粉焊接技术可实现大裕度、高质量的柔性焊接,相较于传统焊接技术具有不可比拟的优势。基于GH3030高温合金开展相关工艺试验,研究了不同的激光功率、扫描速度、离焦量对焊接表面形貌、抗拉强度的影响,并分析了不同离焦量下的金相组织。在激光功率2100 W、扫描速度900 mm/min、离焦量为+2 mm时,可以获得一定熔宽且均匀连续、无缺陷的焊缝;在较优的工艺参数下,焊接后抗拉强度优于母材。各工艺参数的选取对焊接接头的抗拉强度影响很大,在实现良好冶金结合的前提下,避免晶粒粗大、组织疏松是提升抗拉强度的关键。

Compared with traditional welding technology, laser powder-filled welding technology has incomparable advantages to realize flexible welding with large allowance and high quality. Based on the process test of GH3030 superalloy, the effects of laser power, scanning speed and defocusing amount on the weld surface morphology and tensile strength were studied. Under the conditions of laser power 2 100 W, scanning speed 900 mm/min and defocusing amount + 2 mm, the welding seam with certain melting width, even continuity and no defects can be obtained, and the tensile strength after welding is better than that of base metal under the better process parameters. The selection of process parameters has a great influence on the tensile strength of welded joints. On the premise of good metallurgical bonding, the key to improve the tensile strength is to avoid coarse grain and loose structure.