Wechat can add a group by scanning the QR code of the code group. The group QR code is valid for 7 days, and the expired QR code is invalid. At present, most of them join the WeChat group through the invitation of friends. The steps to invite friends to join the group are as follows:

1. Open WeChat and click on group chat;

2. Click on the target group under the group chat;

3. Click the operation icon in the upper right corner;

4. Click the plus sign behind the group members;

5. Check the target contact, and then click OK.