If any person summoned as herein provided shall, without reasonable cause, fail to appear, he may be proceeded against for contempt of court. In case the summons or process cannot be served, or the parties served fail to obey the same, or in any case when it shall be made to appear to the judge that the service will be ineffectual, or that the welfare of the child requires that he be brought forthwith into custody of the court, a warrant may be issued for the child, parent or guardian of the child, or any person who may have control or possession of the child, to immediately bring the child before the court.