Arc welded joint and method for manufacturing the same

An arc welded joint manufactured by arc welding, the arc welded joint comprising:

• a base material;
• a weld bead formed by fusing and solidifying the base material and a welding wire melted by heat input from arc;
• and
• a weld heat affected zone,
• wherein in a weld spatter affected zone whose length in a direction of a weld line is a length of the weld bead excluding weld-bead start and end portions each 15 mm long and whose length in a direction perpendicular to the weld line is 40 mm centered on a center line of the weld bead,
• the number of spatters generated during welding, adhering to the weld spatter affected zone, and each having an adhesion region with a maximum length of greater than or equal to 0.2 mm is less than or equal to 0.50 spatters/cm2, and
• a slag coverage area ratio SRATIO calculated by the following equation (1) using a bead surface area SBEAD of a weld bead surface and a slag surface area SSLAG is less than or equal to 15%, the slag surface area SSLAG being an area of a region of the bead surface area SBEAD covered with slag:
• S
• RATIO
• =
• S
• SLAG
• /
• S
• BEAD
• ×
• 100
• (
• 1
• )
• where, in equation (1), SBEAD (mm2) is bead surface area, SSLAG (mm2) is slag surface area being the area of the region covered with slag, and SRATIO (%) is slag coverage area ratio.