METHOD FOR DEPOSITING STAINLESS STEEL ON LOW-ALLOY CONTENT STEEL BASE MATERIAL USING STRIP ELECTRODE BY SUBMERGED ARC PROCESS

摘要

A method for depositing stainless steel on a low-alloy content steel base material using a strip electrode by submerged arc process comprises: S1. performing pre-weld heating, depositing a first layer of stainless steel on a surface to be overlaid of a low-alloy content steel base material (4) using a strip electrode by a submerged arc process to form a first stainless steel overlaid layer (1); S2. performing a subsequent heat treatment; S3. respectively depositing by the submerged arc process a second layer and a third layer of stainless steel on the first stainless steel overlaid layer using strip electrodes to form second and third stainless steel overlaid layers (2, 3); and S4. performing a post-weld heat treatment to effectively control, by controlling a pre-heating temperature, an inter-layer temperature, a welding current, a welding voltage, a welding speed, a temperature and time of the subsequent heat treatment and a temperature and time of the post-weld heat treatment, a thickness of a hardened layer of a weld joint transition region formed by depositing stainless steel using the strip electrode by the submerged arc process, thereby reducing the thickness of the hardened layer by over 50%. The method enhances joining strength between a weld overlaid layer and a base material, thereby preventing breakage or detachment of a stainless steel overlaid layer of a weld joint formed on a low-alloy content steel base material by depositing stainless steel thereon using a strip electrode by a submerged arc process.