With the continuous development of various onshore and offshore oil and gas resource development activities, the demand for pipeline laying and welding has also increased dramatically. Because of its high efficiency, high quality, and consistent welding seam, the automatic welding technology of all positions of the pipeline has been widely used in the construction of long-distance oil and gas pipelines on land and in the construction of marine engineering, such as the construction of water conservancy projects in the South-to-North Water Diversion Project, urban water supply pipelines, and chemical process pipelines. etc. are promoted. With the further increase in the thickness and diameter of oil and gas pipelines and the use of high-strength materials, higher requirements have been placed on the automatic welding technology of all positions of the pipeline. In the field welding construction of long-distance pipelines, automatic welding methods are also continuously promoted and applied. In recent years, the more mature automatic welding methods used in production sites mainly include solid-cored wire gas shielded automatic welding and flux-cored wire automatic welding.
(1) Gas shielded automatic welding of solid core wire.
Solid wire gas shielded automatic welding (GMAW) is a kind of MIG welding, its principle is simple, and the requirements for welders are low. It is necessary to have a windbreak shelter when working in the field. At present, it has been widely used in the field of pipeline welding with large diameter and large wall thickness in foreign countries. However, due to the all-position welding of the pipeline circumferential seam, the requirements for the welding equipment and control system are relatively high, and the automatic gas shielded welding equipment still has shortcomings such as high cost and difficulty in maintenance.
(2) Automatic welding of flux-cored wire.
Flux-cored automatic welding (FCAW) is an arc welding technology that replaces solid-cored welding wire with flux-cored welding wire, so that the welding seam can be formed. Two gases are available). The basic principle is similar to that of solid wire gas shielded welding. Compared with solid wire, flux cored wire has the following advantages:
The welding speed is fast. The unique structural characteristics and droplet transfer characteristics of the flux-cored wire make its deposition rate faster.
The welding quality is good, especially the impact toughness is good.
Economical, with less welding cost.
Good adaptability to various pipes. Its powder composition can be easily adjusted.
Tianjin Yixin pipeline automatic welding equipment (using pipeline automatic welding system, also known as all-position pipeline automatic welding machine, on-site pipeline welding machine, automatic welding equipment, on-site pipeline welding equipment, etc.) adopts customized professional power supply, adding pulse, double pulse, etc., the welding trolley is light and portable, with reliable welding performance, high degree of automation and less human intervention.
Post time: Sep-06-2022