Underwater Wet Welding for HSLA Steels: Chemical Composition, Defects, Microstructures, and Mechanical Properties

2019

Weld. Tech. Rev.

From many years, the high strength low alloy steels are often used for offshore constructions. This constructions, due to the environment in which they work, require more frequent repairs than the constructions from the land. For economic reasons, repairs take place in the underwater conditions, however water significantly decreases the weldability of steel. The paper presents the results of the CTS weldability test for S460ML and S460 steels, which have a similar value of the yield point, but different carbon equivalent (CeMIS) values. The welded joints were cut into specimens, which were then subjected to Vickers HV10 hardness measurements. The experiment has shown that as the CeMIS value increases, the hardness in the heat affected zone (HAZ) of joints and in the weld metal increases.

Section: Introductionmentioning

confidence: 99%

The influence of the carbon equivalent on the weldability of high-strength low-alloy steel in the water environment

2019

Weld. Tech. Rev.

“…Water environment makes the cooling rate faster. However, the latest investigations show that application of heating induction is possible [17]. Research tests on ultrasonic enhancement the underwater welding processes [18,22] or application of temper bead welding technique [19,24] are also carried out.…”

Section: Introductionmentioning

confidence: 99%

Cold Cracking of S460N Steel Welded in Water Environment

Polish Maritime Research

Łabanowski

Fydrych

2018

This paper shows results of weldability testing of fine-grained high-strength low-alloy S460N steel welded in water environment by covered electrodes. The tests were carried out by using the CTS test specimens with fillet welds. Four specimens were welded under water and one specimen in air. Welded joints were subjected to non-destructive visual and penetration tests. The accepted joints were then subjected to macroscopic and microscopic inspection and Vickers hardness measurements as well. The experiments showed that S460N steel welded in water environment is characterized by a high susceptibility to cold cracking.

“…The most often used form of underwater welding is wet welding, during which the welding arc and the created welded joint have direct contact with water. The process is carried out with the use of covered electrodes (process 111) or flux corded wires (process 114) [1][2][3][4][5][6]. The water environment intensifies the welding process problems.…”

Section: Introductionmentioning

confidence: 99%

Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

Fydrych

Łabanowski

Advances in Materials Science

2015

Water as the welding environment determines some essential problems influencing steel weldability. Underwater welding of high strength steel joints causes increase susceptibility to cold cracking, which is an effect of much faster heat transfer from the weld area and presence of diffusible hydrogen causing increased metal fragility. The paper evaluates the susceptibility to cold cracking of the high strength S355G10+N steel used, among others, for ocean engineering and hydrotechnical structures, which require underwater welding. It has been found from the CTS test results that the investigated steel is susceptible to cold cracking in the wet welding process.