Investors put a record amount of money into investment-grade bond funds this week as corporate bonds solidified their reputation as the best place to generate income with the least risk.

Handing money over

A record $3.3 billion flowed into U.S. investment-grade corporate bond mutual funds, blowing past the previous record of $2.6 billion last June, according to data from Bank of America Merrill Lynch and EPFR Global.