Q2. What future works have the authors mentioned in the paper "Laser offset welding of az31b magnesium alloy to 316 stainless steel" ?
Future work to improve the geometry of welds should validate this statement.
Q3. What is the bonding process of a magnesium alloy?
In this application, the bonding took place thanks to the occurrence of solid state diffusion of Cu into the magnesium alloy, eutectic phase formation, interlayer dissolution, and isothermal solidification.
Q4. Why did the fusion zone move towards the magnesium side?
Due to the asymmetry in the heat conduction, the fusion zone of the steel moved towards the magnesium side where the interface hindered the heat conduction and made this zone overheated.
Q5. What was the effect of the irradiance on the steel side of the joint?
The loss of alloying elements at high laser power density was avoided by the irradiance incident upon the steel side of the joint.
Q6. What is the effect of adding Sn to the magnesium alloy?
The addition of Sn eliminated the gaps distributed along the fusion zone-steel interfaces as the presence of Sn improves the wettability of the Mg to the steel.
Q7. What is the effect of the interaction between materials in two different states?
The interaction between materials in two different states just promoted a cohesive bonding without generating any phases’ coalescence.
Q8. What is the favored distribution of the precipitates in the fusion zone?
Many precipitates concentrated in the fusion zone, in a distribution that tended to grow from a few scattered particles to densely packed coarser ones, which is favored from the total content of Al in the Mg alloy.
Q9. What is the reason for the reduction of the tensile strength?
The reduction of the tensile strength can be related to the irregular shape of the weld bead that affected the load-bearing capability during tensile testing.
Q10. What was the thickness of the az31 welded to stainless steel?
A thin layer, which dimension was in the order of micron, formed in the weld zone, without the need for any interposed interlayer.
Q11. What is the effect of the eutectic welding on the steel and magnesium alloy?
They found that a pre-existing transition layer of Fe2Al5 between the Zn coating and the steel improved wetting and bonding between the steel and the magnesium alloy.
Q12. What is the average deviation of the data values?
A standard deviation of 5.08 and 2.58 mm was observed for 0.3 mm offset and 0.4 mm offset conditions, respectively, which indicates a low dispersion of data values.
Q13. What is the effect of a thin layer of intermetallic compound on the joints?
A thin layer of intermetallic compound forms thanks to heat propagation by conductive and convective heat transfers (see Fig. 2).
Q14. What is the reason why the authors found that joints fractured at the interface or fusion zone?
The authors found that joints fractured at the interface or fusion zone at low/high heat input due to weak bonding or porosity formation at fusion zone.
Q15. What is the name of the method used for the welding of stainless steel?
Such a novel method, also referred as laser offset welding (LOW), consisted in focusing an Yb–YAG laser source onto the top surface of one of the two materials to be welded, at a specific distance from the interfaces, which is called offset.
Q16. What are the drawbacks of the LOW technique?
As a number of drawbacks in Magnesium to stainless steel fusion laser welding were avoided without interposing any interlayer, ithas been demonstrated that the LOW technique has the potential to produce the Mg-steel weld.
Q17. What could be the main reasons for the lack of thermal coupling between sheets?
in the industrial environment, the coupling between the sheets could be exasperated by other factors, including the length of the welds or the capability of the clamping system available.