Abstract
TIG-dressing of 7N01 aluminium alloy welded joint was carried out by shielded metal arc welding. The fatigue properties and microhardness of specimens were tested before and after TIG-dressing, and the fractography was analyzed with SEM and the composition in defect zone was examined with XRD. Experimental results show that TIG-dressing slightly reduced the stress concentration on the weld toe, however, TIG-dressing could also bring additional weld defects which would initiate fatigue crack. The reheating by TIG-dressing could soften the welded joint and degrade the resistance to fatigue crack propagation. Consequently, the fatigue life of welded joint after TIG-dressing slightly decreased. Therefore, it had no feasibility to improve the fatigue properties of 7N01 high strength aluminium alloy welded joint by TIG-dressing.
| Original language | English |
|---|---|
| Pages (from-to) | 105-108 |
| Number of pages | 4 |
| Journal | Hanjie Xuebao/Transactions of the China Welding Institution |
| Volume | 34 |
| Issue number | 4 |
| State | Published - Apr 2013 |
Keywords
- Fatigue
- TIG-dressing
- Welded joint
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