Abstract
Rotating arc horizontal narrow gap welding of quenched & tempered (Q & T) steel was innovatively performed for solving the bottleneck that the molten pool sagged due to the gravity. The shapely multilayer single pass horizontal joint could be obtained by using the rotating arc welding process. The cold crack was not observed in the joint without controlling the heat input and selecting the consumables intentionally. Microstructure of the joint could be divided into three zones: base metal zone (BMZ), heat-affected zone (HAZ) and weld zone (WZ). Because of the characteristic of the rotating arc horizontal welding process, the defects in the joints were slag inclusion formed at the interlayer of lower side wall. The tensile strength and hardness of HAZ and WZ were larger than those of BMZ. The impact toughness in WZ, HAZ and BM at 0°C is equal to 115, 212 and 236 J, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 31-35 |
| Number of pages | 5 |
| Journal | China Welding (English Edition) |
| Volume | 19 |
| Issue number | 4 |
| State | Published - Dec 2010 |
Keywords
- Horizontal welding
- Narrow gap welding
- Quenched and tempered steel
- Rotating arc
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