Thick section laser butt welding of structural steel using a coaxial powder filler nozzle

被引：0

作者：

Shannon, GJ ^{[1
]}

Davitt, C ^{[1
]}

Steen, WM ^{[1
]}

机构：

[1] Univ Liverpool, Dept Engn, Laser Lab, Liverpool L69 3GH, Merseyside, England

来源：

LASER MATERIALS PROCESSING CONFERENCE, PTS 1 & 2: ICALEO '97 | 1997年

关键词：

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An assessment has been made of implementing a coaxial powder fill nozzle for the butt welding of 4 and 7 mm thick structural (shipbuilding) grade steel, specifically accommodating the gap width tolerance. The effect of position of focus, powder mass flow, gap width, shielding gas, energy input, and edge cut quality have been examined. The results indicate that a gap of 0.8 mm can be filled, and that the catchment efficiency of the powder is proportional to gap width, thus offering a self regulating of the gap width provided the energy input is sufficient to melt the additional filler material. The effect of the powder on the welding is an enlargement of the plume, which can become critical at high mass flows. Countering this negating effect, the thermal and physical momentum of the powder may aid weld penetration. The welds show no signs of porosity, good cap geometry and tensile testing confirmed the weld strength.

引用

页码：G282 / G289

页数：8