Properties Effect of 16MnR Steel Weld Joint By Different Welding Methods

摘要

Welding experiments were made with δ=14mm, 16MnR steel by three welding methods, manual electric arc welding, automatic submerged arc welding and semi-auto solid-core CO_2 shielded arc welding, and weld joint test with samples from every welding specimen. The properties of welding joint were analyzed by three welding methods and in every position of welding, concluded that brittlement problems in heat affected zone arise from the CO_2 shielded arc welding, it is because of the heat damage of alloy elements of weld joint metal while using CO_2 shielded arc welding, but the strength of the weld joint is high because of its high fusion ratio. So for improving the mechanical properties of weld joints, it had better accelerate the cooling rate of weld bead and decrease the heat input of welding.