Abstract
Effect of heat input on defects, microstructure and mechanical properties of Q235 steel welded joint was investigated by microstructure characterization, micro-hardness test and tensile test. The results show that although the change of heat input can not completely eliminate the slag defects in the welded joint, the increase of heat input is conducive to reduce the quantity and size of slag. With the increase of heat input, the weld zone and overheated zone expand, the microstructure becomes coarse, and the content of proeutectoid ferrite in weld zone and widmanstatten in overheated zone increase gradually. With the increase of heat input, the microhardness, tensile strength, fracture strain and toughness of the welded joint decrease first and then increase, and the tensile strength of the welded joint decreases significantly due to the presence of slag.
| Translated title of the contribution | Effect of heat input on defects, microstructure and mechanical properties of welded joint of Q235 steel |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 162-169 |
| Number of pages | 8 |
| Journal | Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment |
| Volume | 43 |
| Issue number | 4 |
| DOIs | |
| State | Published - 25 Apr 2022 |