Joint component and manufacturing method thereof

A joint component comprising:

• a first steel member;
• a second steel member;
• and
• a spot-welded portion that joins the first steel member and the second steel member,
• wherein the first steel member includes a steel sheet substrate containing, as a chemical composition, by mass %,
• C:
• 0.25% to 0.65%,
• Si:
• 0.10% to 1.00%,
• Mn:
• 0.30% to 1.50%,
• P:
• 0.050% or less,
• S:
• 0.0100% or less,
• N:
• 0.010% or less,
• Ti:
• 0.010% to 0.100%,
• B:
• 0.0005% to 0.0100%,
• Mo:
• 0% to 1.00%,
• Cu:
• 0% to 1.00%,
• Ni:
• 0% to 1.00%,
• Cr:
• 0% to 1.00%,
• Nb:
• 0% to 0.10%,
• V:
• 0% to 1.00%,
• Ca:
• 0% to 0.010%,
• Al:
• 0% to 1.00%,
• Sn:
• 0% to 1.00%,
• W:
• 0% to 1.00%,
• Sb:
• 0% to 1.00%,
• Zr:
• 0% to 1.00%,
• REM:
• 0% to 0.30%, and
• a remainder of Fe and an impurity;
• and
• a coating that is formed on a surface of the steel sheet substrate, contains Al and Fe, and has a thickness of 25 μm or more,
• in a cross section in a thickness direction of the first steel member and the second steel member including the spot-welded portion, a filled metal containing Al and Fe is present in a gap between the first steel member and the second steel member in a periphery of the spot-welded portion,
• in the cross section, the filled metal has a cross-sectional area of 3.0×104 μm2 or more, and a filling ratio of 80% or more in the gap in a range of 100 μm from an end portion of a corona bond formed in the periphery of the spot-welded portion, and
• the filled metal includes a first region containing, by mass %, Al:
• 15% or more and less than 35%, Fe:
• 55% or more and 75% or less, and Si:
• 4% or more and 9% or less and a second region containing, by mass %, Al:
• 35% or more and 55% or less, Fe:
• 40% or more and less than 55%, and Si:
• 1% or more and less than 4%.