High-temperature welding may cause different degrees of damage to the surface of 3D welding fixture platforms,and the severity of damage mainly depends on the table material,surface anti-wear treatment process,welding operation specifications and workpiece load conditions.
1.Short-term direct damage caused by welding high temperature
During arc welding,splashing molten metal can reach temperatures above 1500°C.When these welding spatters fall onto the tabletop,they will instantly burn and stick to the surface coating.Light damage only leaves black adhesive slag that is hard to clean;severe spatter will burn through the phosphating and anti-wear paint layer,forming permanent pits and rust-prone bare cast iron areas on the table surface.
Continuous local high-temperature radiation will also produce thermal stress on the table surface.If the platform does not pass complete stress relief and aging heat treatment,repeated local heating and cooling will gradually lead to micro-warping of the tabletop,reducing the overall flatness and positioning precision.
2.Different anti-high-temperature performance of mainstream table materials
HT300/HT250 gray cast iron platform
Cast iron contains uniform graphite structures with good thermal conductivity and thermal shock resistance.After standardized stress relief annealing and artificial aging,the base body will not deform easily under intermittent welding high temperature.With plasma nitriding or manganese phosphating wear-resistant coating,the surface can resist most daily welding spatter damage.
Q345 welded steel 3D platform
Steel has poor thermal stability without graphite for heat dissipation.Long-term concentrated high-temperature welding will cause local thermal expansion and permanent deformation of the tabletop,and the steel surface is more prone to rust once the coating is burnt off by welding spatter.
3.Effective measures to avoid high-temperature damage to the table surface
Lay high-temperature resistant asbestos cloth or special welding protective pads on the local welding area to block direct contact between molten spatter and the table surface.
Clean welding slag and residual high-temperature debris on the table surface every day after work to avoid long-term local heat accumulation.
Select cast iron platforms with complete heat treatment and high-temperature resistant wear-resistant coating for frequent high-heavy welding work.
Avoid long-time concentrated welding at a single fixed position;disperse welding points to balance the overall table temperature field.
Conclusion
Standard qualified cast iron 3D welding tables can resist conventional intermittent high-temperature welding without obvious permanent damage under standardized protection.However,long-time concentrated high-temperature welding without protective measures will inevitably burn the surface coating,form surface pits,and even induce flatness deformation of the tabletop.
References
1.GB/T 7714-2015
GOUVEIA R M,SILVA F J,PAIVA O C,et al.Study of the heat-treatments effect on high strength gray cast iron for industrial welding fixtures[J].Metals,2017,7(9):382.
2.MLA 9th Edition
Gouveia,Ricardo M.,et al."Study of the Heat-Treatments Effect on High Strength Gray Cast Iron for Industrial Welding Fixtures."Metals,vol.7,no.9,2017,p.382,
3.APA 7th Edition
Gouveia,R.M.,Silva,F.J.,Paiva,O.C.,&Moselli,P.C.(2017).Study of the heat-treatments effect on high strength gray cast iron for industrial welding fixtures.Metals,7(9),382.
